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Old 08-29-2011, 12:46 AM   #1
65GMCFirstride
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Generator Light

We just got the 65 GMC running this weekend after 10 months of restoration. I will share some photos soon.

The Generator light stays on while driving. I figured out from the forum that it is either not charging or it is a grounding issue. The PO installed a single wire alternator and jumped 1 and 4 on the voltage meter.

I check the voltage at idle and it was 14.1 I did an ohm test from the negative terminal to the alternator casing and it showed good continuity. I verfied continuity on the frame, block, and firewall. I assume that verifies that I have a good ground.

So, any other suggestion on what I should do. I hate to simply pull the bulb.

Thanks!
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Old 08-29-2011, 01:56 AM   #2
1964c-10
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Re: Generator Light

im not sure what the answer is but my truck is doing the same thing, i just figured i had put a bulb back in the wrong position. my truck has also been converted to an alternator.
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1964 C20 custom cab, long fleetside bed, big back window, 4 on the floor

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Old 08-29-2011, 11:14 AM   #3
65GMCFirstride
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Re: Generator Light

When I review the wiring diagram, I see pink and brown wires that feed the generator light. The brown goes to the voltage regulator and the pink to the ignition. I think it has to do with the voltage regulator and the fact I have a single wire alternator. I am heading down that path. I will verify the jumper wire is working on the voltage regulator.

Anyone else have suggestions?

Thanks,
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