Help: Battery Drains When Engine is Hot
I am having an issue where my car (2001 WS6 with 190K miles) starts fine and the voltage is around 13.5V when I start the car cold. Then once the car warms up, the voltage drops to around 11.5V and if I accelerate hard, it will drop into the red area and then go back up to 11.5V(~8V; this doesn't happen if the motor hasn't completely warmed up). Once it drops to 11.5V or below, if I turn off the car, I will not be able to restart it until the motor cools.
I have replaced the alternator with a brand new truck alternator (140A) including a new four position, single wire connector, the battery with a new 700CCA battery, and the starter with a rebuilt starter. If have wiggled all of the wires that I can get my hands on to see if the meter will move up from 11.5V, but none of them caused any changes.
Also, there are no codes.
I am thinking about replacing the serpentine belt tomorrow, but it is less than a year old.
Any ideas?
- Tom