I can tell you have never converted a car to -ground
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> From: Don J. Howard <dhoward@jht.com>
> To: triumphs@autox.team.net
> Subject: Re: Jump Starting TR3
> Date: Friday, December 19, 1997 7:09 AM
>
> 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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