It looks like you're new here. If you want to get involved, click one of these buttons!
Suburban alternator and maybe charging system problems...
I come with a question, but first some background.
I very much like Suburbans, I've owned 3 total. Currently own 2, an '89 K1500, and a '95 1500 2wd. My first was a '75 2500 2wd with a 454. I do all my own maintenance on them, Not to dis any mechanics out there, but I can't afford to pay a mechanic, plus I, for the most part, enjoy working on my own cars. Okay, so now the question.
My '89 had a problem with the A/C idler pulley, the bearing seized. After replacing it I noticed that the charging system wasn't working. I had the alternator tested, it was good. I cleaned the terminals to the battery, checked all the grounds that i could see. I also put in a new battery, and cleaned all the connections at the alternator. Still it's charging the battery with it running. I used a multimeter to test it, at idle it was showing 12.51VDC, when I would rev the engine the voltage would drop. My other Burb at idle shows 14.71VDC at idle.
Anybody that has had any experience with this kind of electrical gremlin, please (pretty please) let me know what other areas I need to look at.