hmm.... you say the alt is new? I would check the pulley, if nothing else.... because I had a similar problem way back when I just got my car... the alt was bad, so I replaced it, not knowing that the pulley was loose.
Anyways, I ended up loosing the bolt that holds the pulley on, and had to get a new one... but while it was loose, it was giving me the wierdest problems... at idle, voltage was fine, under load, voltage dropped way down. I even took the alt. to the shop where I bought it at with no luck; They said it was good after testing... and I went to three shops to make sure it wasn't just thier system that said so.
So, make sure the bolt is tight. if its loose, the pulley will not end up spinning as fast as it should to get the voltage you need out of it. Also make sure the belts are up to spec too!
Anyways, I ended up loosing the bolt that holds the pulley on, and had to get a new one... but while it was loose, it was giving me the wierdest problems... at idle, voltage was fine, under load, voltage dropped way down. I even took the alt. to the shop where I bought it at with no luck; They said it was good after testing... and I went to three shops to make sure it wasn't just thier system that said so.
So, make sure the bolt is tight. if its loose, the pulley will not end up spinning as fast as it should to get the voltage you need out of it. Also make sure the belts are up to spec too!
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