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I second that - make sure they know the passenger side alt must have isolated ground. When you get it back, might be worth checking for continuity between the neg output terminal and the alt's case with a multimeter - just to be sure.

Agreed CombatMech, the wiring diagrams are great.. other stuff, not so much. WoodyNla, you might want to look up how normal chevy 3 and 4 wire alternators work if you are having trouble. I think the chevys work the same as almost all car alternators, and generally have lots of info online...

My Gen1 light faintly comes on too.. but I can't tell unless I'm i the middle of nowhere and all the other lights are off. My understanding is that the lights in the dash actually supply the current needed to excite the alternator. When my Gen1 light burnt out, I had to rev the engine to get...

Hmm.. that's no good. Could be a spare or something.. hope so. Cause if that's your relay - that could be a problem. When you turn the key to "run" before starting, do both Gen Lights come on?