If you install your battery with negative ground you will have to rewire
most of your instruments first. There is nothing wrong with positive
ground. When jump is needed match battery posts + to +, and - to -
using both jumper cables. Never use the Government bumper to bumper
recommendation. These people have no insight into how things work, they
have decided that the remote possibility of a hydrogen gas explosion is
more dangerous than what might happen using their "safe" method. The
auto battery has enough amperage to make a pretty decent arc welder.
What can happen other than the obvious mis wiring in your example with
different grounds, is that direct current always follows the path of
least resistance, so it just might make the connection to the battery
through a brake line or a fuel line, an arc here can put a hole in a
very dangerous place, or start a fire.
Cheers, and Merry Christmas, Don J. Howard
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