Originally Posted by BillBoost37
This is pretty common voltage that you are experiencing.
What year and model to you have? There is a way to bring the voltage up. I and a few others added a pin to the alternator connector in the * or Sense position, then hooked it into a 12+V pink wire (take your choice) in the wiring loom on the back of the motor. This takes the alternator from internally sensing voltage to sensing the 12+ actually running through the car.
Thanks, Bill, but I'm not sure that I really want to do that. My Bonneville is a 1997 and is all original as purchased. It still looks, runs, and drives like it did when new. Also, I have been told I could do that as a test, but that to do so permanetly could cause an overcharge condition, putting out too many amps.
What I really would like to find is a schematic of the internal wiring for the PCM and a complete wiring schematic for the entire charging system so that I can diagnose the problem and fix it even if that means a new PCM. Now I admit that I am not the sharpest knife in the drawer, but I have had to chase down some problems on fighter jets weapons systems in the Air Force. We could not change wiring to patch a problem, we had to fix it and that'* just the way I've done things ever since even though I've been out of the Air Force for over 30 years.
Again, thanks for your reply and if you know where I can get that schematic, I'd really appreciate it.