This morning after the ambient temp rose to 85, the readings at the battery with the truck idling in gear were 13.69v with the A/C system off; 13.36v with the front unit only on hi. I also checked the voltage at the cigarette lighter and found the voltages lower; 13.20v with the A/C off and 12.32v with it on. The voltage will probably be lower this afternoon because the ambient temp is supposed to be near 100.
The alternator and battery have both been replaced since this started with no improvement. Old alt was tested at Advance Auto on their machine and tested good, but was replace anyway because the alt was cool when tested.
Tuesday, July 17th, 2012 AT 2:50 PM