GM Alternator Question

[Scoobum]

Got a 1998 GM alternator here that drops to 12 volts at idle...but goes to 14 above 1500 rpm's. What's gone wrong inside of it?

[Steve Wood]

sounds like it is not getting energized and is acting like a one wire alternator.  Does it have a volt light activation like our Buicks and it it sending voltage to the alternator when the key is turned on?  Otherwise, I would guess the regulator is bad

[Scoobum]

sounds like it is not getting energized and is acting like a one wire alternator.  Does it have a volt light activation like our Buicks and it it sending voltage to the alternator when the key is turned on?  Otherwise, I would guess the regulator is bad

It's in my 4x4...no activation lite. Spose to start raining tomorrow. I'll check it when weather permits.