Alternator good, Battery good, Voltage Low/Car Loses power while driving
I am trying to help my friend fix his 05 or 06 G6 which has a very confusing problem. While driving the car will run out of electrical power, ABS light comes on the the battery light, transmission solenoids fail to shift then the car dies. Running on just the battery it can start and drive for a few hours and even start 3-4 times.
We have tried a total of 4 alternators now including a reman, his original and two OEM junkyard alts. We have fully charged the battery on a trickle charger three times and tested it twice. All are good every time.
When we jump start the car the voltage at any RPM stays between 12.1-12.4 Volts versus 13+ which is what it should be.
How is voltage/current regulated in this car? What should I replace to fix this problem? Are there any recalls about this with G6s?
Thank you very much.