Car has problem with charging system:
Question has come up at the shop is a 39 Lasalle a positive or negative ground?
Always thought all American cars were negative ground.
Thx!
If it's wired as it left the factory it's Positive ground.
Holy crap I had no idea!
Cadillac was positive ground until 1946, 12 volt came in 1953.
Did you buy a voltmeter yet?
Yes I did a Bosch
Sounds good. That will be a great help trying to diagnose your electrical issues. Way better than throwing parts at a problem until either your wallet is empty or you've finally stumbled over the problem.