like waldo says, if you're pegging your ammeter under any condition other than an absolutely dead battery there's something wired way wrong.... the power tapping connections for accessories should come off the same terminal that the alternator is connected to, the other side of the meter goes to the battery [via the starter connection usually], the meter should only be showing the current going to the battery NOT the current being used system wide
a 100 amp breaker anywhere will only serve to cut power after the fire is underway, there isn't anything you're using that should draw anywhere near 100 amps, and each circuit should be fused as required by it's draw .... I suppose if you put it on the output of the alternator it would save things in the unlikely event the alternator decided to put out way more than called for
Bill
