If the circuit breaker is inline with the alternator charge wire, its only going to stop the alternator from charging the battery. You would continue to run off of the battery. Its purpose is to prevent excessive amperage that would cause the wire to heat up, melt through the insulation, and arc out against the body/ground. I had suggested putting it on the ground wire from the battery to the chassis. I think you are running two now so you wouldn't be able to do this but the idea would be the surge of amps would still trip the breaker, it would protect all of the wiring instead though. Of course, I could be dead nuts wrong
