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Originally Posted by Gregski
Greg that was some serious know how you dropped on us, thank you very much.
Couple pesky things to follow up on.
My spade lug connector does not have a red wire it has a yellow wire and a brown wire. But sure enuff about three feet later the yellow wire splices into a red wire and runs to the bulk head.
Now back to that Alternator Idiot light, if there is one on my truck I sure would love to know where?
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My Dad was an automotive electrical systems teacher at our local college. He's long retired, but I've been mucking around with these alternators for 30 years.
Ya, as you guessed, the yellow wire is the small red wire I spoke of earlier. It's good that it goes to the firewall, because this lessens the voltage drop. I've seen some cars where this wire is just looped around on to the main power terminal. This works, but abandons a nice feature these alternators have.
Since you have an amp meter, there wouldn't be an alt idiot light. The brown wire has some built in resistance. My truck had all idiot lights, so when I switched to gauges, I just wired a dash indicator bulb in series with the brown wire and connected it to an ignition hot source. If the bulb lights with the engine running, the alternator has problems.
I should share another trick with you guys, but I have to dig out a picture first.