Quote Originally Posted by 34_40 View Post
My point exacty! Every time the circuit becomes complete an arc will occur! It doesn't matter if it's + or - ! Consider an arc welder, it can be positive ground or negative ground. There will still be an arc when the circuit becomes complete! Don't believe me? Fire up you stick welder, clip the electrode holder to the steel and clamp the ground to a rod, yes, you can still weld with it! the circuit will be completed! And don't ask me how I know this! I guess I can be silly to prove a point!

If you plan for the circuit to stay isolated you will be prepared! I like the breaker idea too!
I must be getting brain farts..are you saying that if I went out and disconnected my negative battery cable from where it is mounted to the frame, and then tapped the frame with it, I would still get an arc? I would have thought that I would have to actually touch a positive wire to accomplish that. I can't see how a circuit would be completed, with a ground to ground contact.

Now on the other hand, if I disconnected my positive cable say from the starter, and then started tapping the frame, or any other grounded point, I know I would get arcing.