Quote Originally Posted by Chev malibu View Post
In this case, if the power switch had been wired to the ground, and the battery ground cable broke off the switch and dangled, there would be no complete circuit, simply ground to ground. The postive cable would be grounding out every time it hit a frame part, or fuel tank, and arcing like crazy.
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!