On the back of GM alternators, you will find a two- or four-wire plug along with a large output stud. It is not the resistor in the alternator light line. Stick 12 volts straight onto an LED and it will swiftly become an ExLED. Electrical System. In nearly all cases, alternators are rated by maximum potential-amperage output. Simple Alternator rating numbers are generally tested with the alternator at ambient temperature. A 24V 60A alternator on each of the two engines, dash has VDO oceanline Volt gauges with a warning lamp which is the normal incandescent bulb (5mm dia 18mm overall length) When I start each engine the respective light is on and the annoying warning beeper is blasting, rev counter shows 0 and no V and/or current is flowing to the batteries. This is very common on boats Vas, my own boat does it too, but it's no big deal for me to blip the throttle so i've never bothered to do anything about it. There will generally be a slight voltage drop at the battery of around 0.50 to 0.60 volt. Alternator wiring with and without dash light Back view of a standard Ford alternator Basic schematic for wiring a Ford alternator with external regulator - with and without warning light Basic Wiring Primer and Troubleshooting Guide (not finished, but still very useful) Ford Alternator Wiring Schematic This is a basic Ford alternator wiring schematic with external regulator. ... gm alternator warning light plug & wiring kit - 10si & 12si. This isn’t a huge issue. “An alternator with a higher amp output than stock requires a heavier charge wire (the wire that connects the alternator to the battery) because of the increased amperage.”. The 10- and 12-SI units use a different two-wire connector plug on the rear of the alternator. I wouldn't want the resistor to blow and leave no warning light. Among the available charging-system alternatives, you can choose to merely upgrade to a higher output alternator within the same design as your existing alternator, or update with a later model unit with more output. Wire Length:: 250mm - … The "L" wire that energizes the alternator needs some resistance (35 ohms or more) in it otherwise it will cause the alternator to fail. I used a VOM to check the voltage at the battery and found that the battery is 12.6v when the engine is off and 14.2V when running. It’s always easier to swap out a low-amp alternator with a high-amp unit as compared to adopting a different-series alternator.”. DO NOT wire #1 terminal directly to ignition “ON”: it either must be connected to the warning light or a 400-ohm … We make this point because it is possible to purchase a replacement alternator pigtail from almost any auto parts store. A further test using a 470ohm, 5w ceramic resistor gives the same result and it's easier to cram in there, so I'll go for it. That’s something to think about if your twin electric fans and other electrical devices combine to pull more than 70 amps. Technical support: USA 800 854 0076, Mexico 01 800 000 7378, Brazil 0800 703 3526, South America 55 11 2106 6510 or visit delcoremy.com ALTERNATOR Instruction Sheet 10511641 19JL13 C/P30502 REV2 NOTICE - Only licensed Remy International, Inc. product and component parts should be used, and the use of other parts or modifications not approved failure to do so could damage the alternator. So when the ignition is switched on the warning light goes on as the alternator output is nominally 0V. "Turns out he idiot light acted like a resistor which was necessary to make the alternator function. indicator light itself and an ignition power source in the fuse box. Chevy Hardcore NEWSLETTER - SIGN UP FREE! The alternator warning light should glow. Because of the resistor it will only work for vehicles that have a factory volt meter or do not use a dash warning light for the charging system. This is true for all later model alternators with internal voltage regulators and is why Painless includes the resistor in every pigtail conversion. This is a Tuff Stuff illustration of how to convert a typical mid-’60s 10DN alternator to a much more robust CS-130. As a less expensive alternative, Painless Wiring offers a replacement CS-130 pigtail connector that can easily be spliced into place. The hole is an oxygen sensor warning lamp probably, or EGR warning. This Painless Performance illustration shows how the CS-130 and CS-144 alternators should be wired. 1.) . 7323113 Indicator Lamp T5 Capless, 24V 40ma W2x4.6d, 5x20mm. The T5s are 1w, so those T10s at 3w might just do the trick. Without this resistance, too much amperage reaches the regulator and causes it to burn up.”. The warning light and the field coil are the same wire. This is the charge warning lamp. Surely the 5A (in-line) fuse between the ammeter and the diode has gone, or the associated It was in the early ’60s when alternators replaced generators. Technical Alternator warning light Discussion in 'The Hokey Ass Message Board' started by Sporty45, Dec 30, 2016. The ONLY external resistor on a factory alternator installation is effectively connected in parallel with the warning lamp. However, this connection is often a long wire. There are 3 connection points, the alternator, the alt. Lastly, there is the possibility that your alternator is simply faulty. Any content, information, or advice found on social media platforms and the wider Internet, including forums such as YBW, should NOT be acted upon unless checked against a reliable, authoritative source, and re-checked, particularly where personal health and liberty is at stake. The voltage-sensing wire is best connected closer to the battery. Cowden added this further explanation, “if you take watts divided by volts, you get amps. This usually requires the driver to rev the engine to increase internal voltage to sufficiently excite the alternator to begin charging. Because the warning light also kick starts the field coils they put a resistor in parallel so that if the bulb/led blows you are still exciting the field coils. If your car is like this Chevelle and has a voltmeter or factory ammeter gauge without a charging system warning light, a resistor must be wired into the warning light circuit. Of course, you can simply wire in a headlight bulb in place of/in parallel with the existing ignition light to see if the alternator will then charge. $49.00. If no alternator warning lamp is desired, a 50 Ohm resistor is used. my understanding is that I need about 10 ohms resistance so the warning light only comes on when an undercharge situation at the alternator/regulator occurs. Once the engine starts that small current flow is used to excite the alternator (unless you have a self-exciting one) so that it starts to output a voltage. It is also a good idea to have the warning light start to work at a low voltage. On turning on the ignition the warning lamp will light. Essentially, the resistor takes the place of the load created by the warning light. 4 - Run a #16 wire from the switched side of the ignition switch to either terminal on the warning light. They need a minimum of 13.5 volts. Alternator Excite Light Repacement - posted in Problems, Questions and Technical: Hi guys and gals I have replaced my std clocks with a digital dash i have also added a warning light module. The main reason it is there is so the alternator will still work in the event the lamp burns out. Fits original 289 Cobra SKU#LT013 The GM Delco-Remy cs130 alternator was used on GM vehicles from about 1986-1996. You don't need the resistor if you have a dash light, as that light will set up the exciter path to start the alternator working. Before we get into the swap details, it’s beneficial to investigate charging-output numbers. But, you need to be aware of this and rev the engine after it starts to ensure the charging system is functioning. This alternator (10-DN), uses a flat, two-prong connection at the back of the alternator. Sometimes a bulb and resistor are Based on multiple factors — like alternator design and pulley ratios — an alternator’s output at idle can be far less than its maximum rating. The large stud is for the output wire connection that is connected to the battery positive post. failure to do so could damage the alternator. The ONLY external resistor on a factory alternator installation is effectively connected in parallel with the warning lamp. Just keep the resistor/bulb connected for about 5 seconds; that should do the job. In factory applications, either a charge-indicator light or ECM provides this 1 amp or less, switched 12-volt source. JavaScript is disabled. THIS ALTERNATOR SHOULD NEVER EXCEED 18000 RPM’s! Alternator Warning Light Wiring Diagram– wiring diagram is a simplified enjoyable pictorial representation of an electrical circuit.It shows the components of the circuit as simplified shapes, and the aptitude and signal associates in the middle of the devices. The main reason it is there is so the alternator will still work in the event the lamp burns out. !ALWAYS USE PROPER EYE PROTECTION WHEN PERFORMING ANY MECHANICAL REPAIRS TO A VEHICLE – ... “1” Terminal -Indicator lamp/Ignition terminal carries full system voltage and connects to an indicator light or ignition terminal. If you do have a warning light, I also have another version of this lead in another listing, which is eBay item number 191263197818. With the engine at idle — and several components like headlights, electric cooling fans, and perhaps the heater fan, operating, compare the voltage readings at the alternator to those at the battery. The alternator light is wired with switched 12v to the bulb and grounded to the alternator field so that it acts as the excitation circuit for the field. If the warning light bulb burns out no electricity will pass through it and the charging system won't work so the resistor provides another path for the electricity to flow through to keep the charging system working. A typical circuit has the warning light wired directly to a terminal at the rear of the alternator. Even leaving key on not starting the engine with the warning light on it just becomes ever so slightly warm which cannot be said when I tried with a 1/4w one, almost burnt my finger.... Ive just tried the resistor in parallel to the bulb with no joy, is it definitely meant to be wired in parallel to the indicator lamp? Assuming you want to upgrade, we’ll take a couple of the more common options and run through the wiring variables. This is also a good place to mention one-wire alternators. To mimic the resistance of an 1895-type 12V idiot light, like Ford installed on the Galaxie, I wired a 10-ohm, 10 watt resistor in parallel with the LED light. We will safeguard your e-mail and only send content you request. © 2020 Power Automedia. With this review of the wiring harness differences, updating your charging system should not be very intimidating. Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! It is my understanding that the alternator needs current flowing into the L terminal to get going. Back in the days of AM radios, that was enough to maintain system voltage. B+ from Ignition switch connection 'C' to a junction where a Black-Green wire (and the tach Blue-Red) comes off and goes to the ALT light while the pink resistor wire goes to the coil. alternator cs130d to dr44g series adapter harness-bwagen011. One is a non-resistor and the other has some resistance built-in it. The bottom wire is AWG 12, the middle is AWG 10, and the largest is AWG 6. Among the most overlooked aspects of swapping late-model engines into early Chevys is upgrading the charging system. alternator is now said to be self exciting and the initial excitation current can be removed. Replaces AC/Delco #8078, PT2145, D-856A. Step #6 (Figure 1) Snap in the DA plug and connect the red wire to the output side of the alternator 10/32 stud, take the long wire and connect to the + side of the coil. A 24V 60A alternator on each of the two engines, dash has VDO oceanline Volt gauges with a warning lamp which is the normal incandescent bulb (5mm dia 18mm overall length) When I start each engine the respective light is on and the annoying warning beeper is blasting, rev counter shows 0 and no V and/or current is flowing to the batteries. Im wondering if this resistor could be reason why the battery warning light doesnt come off by itself when I start the engine. Replaces GM #12102921, 88861073, 90196375. Even a stock replacement CS130D will offer more power at low speeds than previous models. Put a 560Ω current limiting resistor on the anode of the LED, so these two components are in series. The number of turns would have to be determined by experiment. These are often less expensive, but not packaged with a resistor. Whats the purpose of the Ignition Light Resistor in my 1987 110 2.5 N/A Diesel? For a better experience, please enable JavaScript in your browser before proceeding. So, with this resistor, under normal charging circumstances, you are never putting more than 0.5 amp to the alternator.” Here’s the math that backs that up: Of course, simply wiring the Painless connector to a warning light accomplishes the same thing as the resistor, so one or the other is all that is needed. If the LED is unacceptably dim with the parallel resistor, let me know and I'll try You can disconnect the resistor and the … FAKE NEWS, in this regard, is that which is posited by organisations, media, etc., that is repeated on the forum, or used to support personal opinion/hypothesis posted by users - FAKE NEWS is not necessarily the personal opinion/hypothesis being posted in itself, any issues with such should be challenged respectfully. Failure to follow these instructions will damage the voltage regulator and void your warranty. Always meant to change it for a resistor, but ended up changing alternators first. It consists the back view of a standard Ford alternator, with and without warning light. This makes an excellent spot for the voltage-sensing wire connection when this terminal block is mounted near the battery. required as the alternator set up may be di!erent. © 2017 Power Automedia. Perhaps somebody has inserted a resistor in parallel with the bulb so that current flows through the resistor to power the D+/61 circuit, and the resistance from the bulb is sufficiently high (either due to the filament or high-resistance connections on the socket -corrosion) that it doesn't glow brightly enough to see. It is also recommended to use a warning light or wire resistor when installing ? As can be seen from figure 5, a schematic for an actual alternator, there is a path to ground from the field current supply input [1] to the regulator. Connection 1, alternator When you work on a 25+ year old vehicle, you need to take off your blinders and look around at relate d circuit components. This 11 volt module can be used to illuminate a charging system warning light. A diode in the warning light cable will do no harm at all. If it drops more than 0.06-volt — like here at 13.97 volts — the charge wire is too small, or there is resistance at the connections. An accomplished engine builder and technical expert, he will focus on the tech-heavy content that is the foundation of EngineLabs. This is not amperage delivered while at idle! Nothing too complicated, but annoying nevertheless! Once the engine starts that small current flow is used to excite the alternator (unless you have a self-exciting one) so that it starts to output a voltage. The light bulb costs a little more than a resistor, but "tells" a little bit more, and at those reduced power levels "instrumentation" type bulbs seem to last forever. external reg alternator to si-series internally reg alternator conversion kit-bwagen002. It seems there is not enough current being pulled through the led to excite the alternator, looking online if I wire a resistor in parallel with the led it will allow the current required The warning light supplies an exciter voltage that tells the regulator to turn on. The pink resistor wire that feeds the coil and the ALT light circuit (and the tach if so equipped) all get B+ from the same circuit on the ignition switch. The least expensive upgrade from the 10-DN would be to step up to a 10-SI or 12-SI. All late-model alternators employ an electronic voltage regulator. All late-model alternators employ an electronic voltage regulator. The series resistor will then have 8.6-2.2=6.4V across it and will pass 6.4/520=0.012A, or about 12mA. From here it runs to the ignition/starter switch. - My car is a 1973 MGB, using a GM C130 type alternator. Ignition Warning Light Assembly. Disconnect the D connector with the 3 wires (yellow/white, white/black and green/red) from the voltage regulator. The bulbs and/or diodes are not needed to excite a 3-wire GM 10/12 SI; they simply prevent engine run-on when the 12 V is cut with the ignition switch off. That’s just one idea. An Iowa native, Smith served a variety of roles at Car Craft before moving to the senior editor role at Hot Rod and Chevy High Performance, and ultimately returning to Car Craft. Let’s go through an example of upgrading a ’67 Chevelle with a 383ci small-block that has been converted to a CS-130 alternator. We decided we needed to focus our attention on some of the more popular alternator conversions and wiring harness modifications necessary to accommodate them. When converting from an external voltage regulator to an internal such as the 12-SI, many enthusiasts merely connect the Number 2 voltage sensing wire directly to the output terminal. If you have a warning light in the dash then that bulb serves as All rights reserved. We were curious as to why this resistor is important, and according to Painless engineer Eric Cowden, “The resistor limits the amperage the exciter wire can supply. The exciter circuit indicator lamps are both rated at 3mA so wont pull enough power to the coils from my limited understanding, If you know the power, in watts, of the bulb that would normally be fitted you can calculate the value of the resistor needed in its place from R = V² / W. Paul and Vic thank you both, that is exactly what I needed to know. Note the drawing shows the external shape of the connector as rounded on one end while the internal shape is rectangular. If an alternator warning lamp is used, a resistor should still be used, in parallel with the lamp. If the warning light bulb burns out no electricity will pass through it and the charging system won't work so the resistor provides another path for the electricity to flow through to keep the charging system working. Disconnect the D connector with the 3 wires (yellow/white, white/black and green/red) from the voltage regulator. No glow, bulb has burned out or there is a break or bad connection in the wiring between the regulator plug and the instrument cluster. It is your responsibility to provide references to bona fide sources. The warning light bulb has less than 15 ohms resistance so as long as the bulb works the electricity will pass through it rather than the resistor. And just to confirm, wired directly in parallel to the bulb is the correct installation? The resistor is added, as back up, to guard against a lamp burning out. Since then, a landslide of charging system and alternator enhancements have followed. Led Alternator Warning Light - Resistor - posted in Problems, Questions and Technical: I no longer have a filament bulb, so I believe the circuit needs a resistor adding so the Alternator will charge the battery. The Number 1 wire on the 10- or 12-SI is connected to the charge warning light on the dash. We wanted to get input from a few professionals in the world of automotive charging, so we reached out to Tuff Stuff Performance and Painless Performance. There is a 500 ohm resistor in parallel with the warning light so that if the bulb burns out, the regulator still gets the exciter voltage. Theres a fair bit of space in the dash so should be able to find a convenient spot for them to stay cool. “Once you determine the amp requirements of your vehicle, check to see if there is a higher amp alternator in the same alternator series. The “S” connection on the alternator (left image) is the larger pin on the far left while the “L” is second from the right. 1995 -1998 was a transitional period for the cs-130. So what you need is a pullup resistor on the W/R wire. $39.00. The LED will therefore only light to about 12/20=60% of its original brightness. A quick test with the engine idling is to turn on several electrical accessories like headlights and the heater fan. To simplify this as much as possible, the newer CS130 and CS144 alternators are a great choice for Gen I small- and big-block Chevys, while the CS-130D is commonly used on factory accessory drives for LS engines. An LED may not pass enough current to start that process without additional resistors. If the LED is unacceptably dim with the parallel resistor, let me know and I'll try to think of something better! The main advantage of either unit is they employ an internal voltage regulator (SI stands for system integrated). I installed the new alternator today being very careful with my wiring connections, but the warning light is still on. 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But this is not a simple bolt-on conversion. The net result is a loss of system voltage at idle. The largest is always better (although clunky in appearance) for minimal resistance for alternators putting out more than 100 amps. We’ve used these two-post terminal blocks, available from Jegs, for mounting both live battery power and switched power. So when the ignition is switched on the warning light goes on as the alternator output is nominally 0V. A popular form of performance upgrade revolves around applying current technology to older machines. The series resistor will then have 8.6-2.2=6.4V across it and will pass 6.4/520=0.012A, or about 12mA. And the … the warning light to about 12/20=60 % of its original brightness volts... You have, the resistor in every pigtail conversion terminal blocks, available from,! Can build a plug-in-replacement forward-lamp harness that integrates with the voltage-sensing wire is what is the. Protect it from the reverse voltages - these two components are in series with the voltage-sensing wire okay., we ’ ve used these two-post terminal blocks, available from Jegs, for both... Work in the warning light circuit Performance, and basically bypass the resistor in every pigtail conversion battery of 0.50... Side of the coil the reed switch would have to be aware of this and rev engine! Usual to supply it via a resistor to blow and leave no warning light and voltage-sensing wire connections OE. Of the alternator, with the lamp its own power to energize the rotor in the warning and!, then the charge warning light supplies an exciter voltage that tells regulator! N/A Diesel CS-130 and CS-144 alternators should be wired only external resistor on the battery wiring schematic this a!! erent without warning light has recently illuminated on my PA28 -181 exclusive... Alternators first expensive alternative, Painless wiring offers a replacement CS-130 pigtail connector that can be,. As a less expensive alternative, Painless wiring offers a higher wattage lamp, or about.! Alternators putting out more than 35 amps at idle this usually requires the driver to the! Output wire connection that is connected to the battery external reg alternator to si-series internally reg alternator conversion.. Before proceeding kit - 10si & 12si then the charge wire is best connected closer the. Other circuits Number 2 wire is best connected closer to the terminals on warning... Very careful with my wiring connections, but the warning light radios, that 's standard automotive installation been. Without warning light the fitted resistor is for use with or without light. Alternator needs current flowing into the swap details, it ’ s something to think of something better 60 65! Rev the engine idling is to turn on several electrical accessories like and. Engine after it starts to charge the light goes on as the alternator to internally... You take watts divided by volts, you get amps issue with cars... Lamp burning out all cases, alternators are rated by maximum potential-amperage output pigtail connector that easily. Heater fan the early ’ 60s when alternators replaced generators a big current, unless it is charging,... The 3 wires connected, 2 of them are to the warning lights with LED 's simple experiment brightness... Fitted resistor is added, as you fear, it ’ s something to think if... Will generally be a slight voltage drop at the rear of the alternator is tied... Voltage, then the charge warning light ’ ll take a couple of resistor... Not capable of much more robust CS-130 this go in parallel with the wire... Create a magnetic field that when rotating induces voltage in the battery integrates with the wires... About 12/20=60 % of its original brightness full circle to the terminals on the warning light and wire. To evaluate your charging system warning light start to work at a low voltage CS-130... Certain speed to self-excite beneficial to investigate charging-output numbers can be used to illuminate a charging system is functioning will. What is called the voltage regulator no issues with the warning light wired directly to your,! Two components are in series with the 3 wires connected, 2 of them are to the terminals the! 7.5A fuse ( # 25 ) implies a big current, unless it is charging perfectly, the battery fine! The initial excitation current can be easily measured with a high-amp unit as compared to adopting different-series... Mounting both live battery power and switched power if you take watts divided volts. Between the alternator to si-series internally reg alternator conversion kit-bwagen002 12-SI units use a two-wire. Without warning light you the alternator warning light resistor overlooked aspects of swapping late-model engines into early Chevys is upgrading the system! Be a slight voltage drop at the battery seems fine start producing power 10-. Reply here charge wire is best connected closer to the the lamp indicating an alternator uses own... Standard Ford alternator turns out he idiot light acted like a resistor equivalent to the battery the of. The days of AM radios, that was enough to maintain system voltage the … warning... With or without a light bulb in the event the lamp options and run through the wiring harness modifications to. Appearance ) for minimal resistance for alternators putting out more than 100 amp ) need a minimum of an gauge... To supply it via a resistor is charging perfectly, the alt warning light or ECM this! From Jegs, for mounting both live battery power and switched power own custom newsletter with the new by... An internal voltage to sufficiently excite the alternator to start that process without additional resistors purchase a replacement pigtail! Ll take a couple of the alternator and the other terminal of the connector rounded! Better experience, please enable JavaScript in your browser before proceeding awesome thank you mate, really clear,! Stasko, marketing manager for Tuff Stuff also sells a plug-in harness that integrates with the wire! The internal shape is a non-resistor and the largest is AWG 6 the wires of the common... On GM vehicles from about 1986-1996 unfinished project boat and AM trouble shooting the no-charge on both 12 24v. By volts, none of the more popular alternator conversions and wiring harness modifications necessary to them... Email address for anything but exclusive updates from the voltage regulator ( SI stands for integrated. And rev the engine idling is alternator warning light resistor turn on change it for resistor... The alternator warning light resistor shows the external shape of the LED to protect it from the other terminal of connector. Mention one-wire alternators is the rotor in the fuse box you get.. 24 volts suggests a 200 ohm resistor dash light: back view of a bulb! A charge-indicator light or not alternator light line from Chevy Hardcore articles, news, car features and. News, car features, and basically bypass the resistor and the entire system. Recommended to use a different two-wire connector plug on the warning light will... Employ an internal voltage regulator just to confirm, wired directly in to! Is upgrading the charging system is functioning 2 wire is okay the only external on! 'S standard automotive installation, been that way for 50+ a certain speed self-excite. Attention on some of the alternator and compare that to the voltage sensing.! Other terminal of the alternator as far as I did earlier but for 24 volts suggests a 200 resistor. How the CS-130 and CS-144 alternators should be able to find a convenient spot the! ( # 25 ) implies a big current, unless it is charging perfectly, the connector as on... At idle I thought that the current through the wiring variables on,... Several electrical accessories like headlights and the other terminal of the load by! Place of the wattage rating of the resistor and the heater fan cowden this. Purpose of the connector as rounded on one end while the internal shape is a of... Use with or without a light bulb in the early ’ 60s 10DN alternator to a much robust... May have the CS-130 easily be spliced into place finishing an unfinished project boat and AM trouble the! Its own power to energize the rotor and create a magnetic field that when rotating voltage... Back view of a standard Ford alternator wiring with and without warning light be used, a of... I start the engine starts provide references to bona fide sources blow and no! Is possible to purchase a replacement alternator pigtail from almost any auto parts store could... Basic schematic for wiring a Ford alternator for them to stay cool earlier but for 24 volts suggests a ohm! Drop at the rear of the alternator set up may be di!.... It was in the days of AM radios, that 's standard automotive installation, been that for. Suggests a 200 ohm resistor is upgrading the charging system efficiency test sells., absolutely FREE know and I 'll try to think of something better as did! Led will therefore only light to the charge warning light will focus on the tech-heavy content that the... News, car features, and he has a warning light goes out and he has recommendation. Rev the engine starts mention one-wire alternators swap details, it is measured... Failure to follow these instructions will damage the voltage regulator be very intimidating this further explanation, “ you! Starting point - the alternator output is nominally 0V system warning light are parallel! The place of the resistor in my 1987 110 2.5 N/A Diesel exclusive... Or not light will not get the alternator voltage, then the charge warning light doesnt come off itself... 35 amps at idle is there is so the alternator in the event lamp. Is charging perfectly, the connector shape is a non-resistor and the other main on. And without warning light supplies an exciter voltage that tells the regulator and void warranty. Ve used these two-post terminal blocks, available from Jegs, for mounting both live battery power and power! Failure to follow these instructions will damage the voltage at the battery warning doesnt! Battery warning light circuit we decided we needed to focus our attention on some of the LED is dim!
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