Need help wiring LS alternator!
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Teching In
Joined: Dec 2008
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From: So. California
Need help wiring LS alternator! I have a 1969 Chevelle. I put an LS2 engine in it and am using the front drive accessories for a Corvette (GMPP kit #19155067). I am also using the GMPP LS2 ECM and wiring kit (DBW) #19166568. I am trying to connect the alternator up. I have removed my old voltage regulator (BLUE, WHITE, BROWN & ORANGE wires) from the car. According to the wiring diagram for the car the BROWN wire goes to the GEN light inside the car. The wiring harness for the ECM has a plug marked "GEN" for generator that goes to the alternator. There is only one ORANGE wire in this plug. I've traced it back to the wiring harness' fuse box and it shows to be a constant 12V. When I purchased the front drive accessories I also bought an adapter plug for the alternator. This plug has four GRAY wires. Can anyone tell me how to hook up the alternator? Do I need to use the single wire from the ECM harness? Or, do I need to use the 4 wire adapter and wire it in? How do I wire this new alternator into the car's existing electrical system having removed the old voltage regulator? If anyone has a detailed diagram taht would sure help! I was trying to get this thing finished up this weekend. Thanks for your help!
Try to search "finally figured out alternator wiring". When I did mine I used the diagram from that thread. My alt only has a two wire connector green and brown I think, it was from a truck set up. One gets 12v constant and the other I had to solder a 470 ohm resistor in to get it to work, fried the first alt trying the bulb in the line method but that didn't work out for me. I think the 4 wire connector is the same, only uses center two wire, though I'm not sure. I think there are some threads in the FAQ's at the top of the page you might try.
I have a 1969 Chevelle. I put an LS2 engine in it and am using the front drive accessories for a Corvette (GMPP kit #19155067). I am also using the GMPP LS2 ECM and wiring kit (DBW) #19166568. I am trying to connect the alternator up. I have removed my old voltage regulator (BLUE, WHITE, BROWN & ORANGE wires) from the car. According to the wiring diagram for the car the BROWN wire goes to the GEN light inside the car. The wiring harness for the ECM has a plug marked "GEN" for generator that goes to the alternator. There is only one ORANGE wire in this plug. I've traced it back to the wiring harness' fuse box and it shows to be a constant 12V. When I purchased the front drive accessories I also bought an adapter plug for the alternator. This plug has four GRAY wires. Can anyone tell me how to hook up the alternator? Do I need to use the single wire from the ECM harness? Or, do I need to use the 4 wire adapter and wire it in? How do I wire this new alternator into the car's existing electrical system having removed the old voltage regulator? If anyone has a detailed diagram taht would sure help! I was trying to get this thing finished up this weekend. Thanks for your help!
Sounds like your car has an idiot light. If want to keep it, you will need to wire the car harness's brown lamp wire to pin "L" which is the third one from the engine. That wire requires the resistance of the lamp to keep from frying the alternator.
Either of these two wires (independently) will charge the alt., I'm not really sure if running them both together will hurt anything or not. My guess is you'll be OK with both...
HTH,
Russ
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TECH Senior Member
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From: Central Cal.
You are replying to a 10-year old thread whose participants are long gone. Check your dates next time.
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To answer your question, if you connect your alternator "L" terminal to your original dash alternator light wire, it will regulate and function as the original alternator, only better. The "L' terminal is very faintly embossed near the back of the alternator connector.
You sure like to beat the ***** off people responding to old posts. Now perhaps it's content generators, or perhaps it's actually real people. Either way, why does it bother you? The mean group is on bullet ✓
TECH Senior Member
Joined: Jun 2016
Posts: 22,306
Likes: 3,621
From: Central Cal.
You'll notice I'm not rude or crude, just honest.
Mainly it's so they won't expect a reply from anyone they are replying to, as they are usually long gone.
I love this comment. If he would of asked a question would you of said "do a search" in reality you also replied to a ten year old thread. Anyway looks like his question was answered so a ten year old thread can't be all that bad.
