Saturn Repair Problems? Ask a Mechanic for Answers ASAP
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Your charge rate is controlled by the duty cycle from the PCM (computer) and in most case this type of a overcharge will cause the computer to set and store a fault code. Have you scanned the system to see what the fault code and or codes are?
Its over charging at 20 volts and this can cause all sorts of issues as well. Have you connected a scan tool to the system to see if the PCM is setting any codes. All your doing when you shut it off is resetting the computer. The problem may very well be with your computer. A code scan needs to be done.
In most case the computer should set and store a fault code and hold it. It dose not have to be running, turn the key on and scan it and lets see if there are any codes in memory.