I need some help- circuit breaker question 6V vs 12V

[rotorwrench]

Fuses and circuit breakers are sized for the wire being used. I use a chart published in the FAA Advisory Circular AC42.13-1B when I have to perform alterations to circuitry or add something new to the helicopters. The wire length has a factor in this but electrical engineers use a bigger wire to suit the amperage needs when the wire lengths get excessive. This is all figured in wire size & length charts both in bundles and in free air runs. Many times I'll use a smaller circuit protector so as to better protect the actual electrical component. You can use any size smaller that you want but you can't use a larger size than the chart allows for.

The old Fords mostly used a 35-amp system and the largest wires in the system with exception to the starter & battery cables are well protected with a 30 or 35-Amp breaker. If they call out a 30 Amp breaker and you can find one the same size, it will work. I see them all the time at the local truck stop. Same ones I use on my Harley Davidsons.

Kerby