We were having a discussion today at work about positive ground vs. negative ground electrical systems in cars. Everybody there had a good understanding of auto electrics, but nobody could say definitively why negative ground was better. I wonder if some of you here could shed some light on this subject for us.
For the most part, American car manufacturers used positive ground electrical systems in the 6 volt days (except for GM, REO, Ford Model T's, some Lincolns and pre-GM Cadillacs) until they switched to 12v around 1955, then they all (except for Packard) switched to Negative ground electrical systems.
The question is why. What is the advantage of negative ground electrical systems over positive ground systems?
I know that some of you on this site have a background in electrical engineering, and many of you have forgotten more than I'll ever know about electricity, So I ask you to please tell us - What are the advantages to having a negative ground electrical system in a car versus positive ground?
For the most part, American car manufacturers used positive ground electrical systems in the 6 volt days (except for GM, REO, Ford Model T's, some Lincolns and pre-GM Cadillacs) until they switched to 12v around 1955, then they all (except for Packard) switched to Negative ground electrical systems.
The question is why. What is the advantage of negative ground electrical systems over positive ground systems?
I know that some of you on this site have a background in electrical engineering, and many of you have forgotten more than I'll ever know about electricity, So I ask you to please tell us - What are the advantages to having a negative ground electrical system in a car versus positive ground?