1999 Pontiac Firebird V8 Two Wheel Drive Manual 66000 miles
Hello, I'm having a problem with my Battery charging on my 1999 Trans Am. The car will not charge the battery over 11.8 volts. I installed a new Optima Battery, Alternator, Battery Cables, and even a PCM (I was originally getting DTC P1638 Generator L-Terminal Wire). With the car running, I am measureing 14.4 volts at the battery but for some reason it will not charge above 11.8 volts. When I connect a home charger, it will charge to 12.66 volts. I've been trying to diagnose this problem for about a year now so any help would be greatly appreciated.