What voltage should a buick regal 31 1990 v6 be mine charging at 15 volts is this to much as battery will no longer hold charge?
The system is a 12 volt. The maximum charge rate should be less
than 15 volts. The charging system needs to be tested, to see which
component is NOT working properly. It could be the alternator, the
voltage regulator, or the battery. The test is called a charging
system check. Jim Bunting. Toronto.