Hey guys, old thread but I have similar questions and I utilized the Search button so...
Currently in my car, I have 4 awg and a circuit breaker (not sure on the amperage..old system was installed by Sound Innovations in Hayward, CA). The shop set it up like this with the 4 awg run going from the battery back to two 1 farad caps. Well, that was a while ago and the caps are long gone. I have my US Amps in there now hooked up to the same 4 awg run, but I'm upgrading the Big 3 and run from battery to amp to 1/0 pretty soon, so I was wondering how I should go about fusing. I already bought a US Amps 1/0 fuse holder that has a 250a fuse in it, but I like the simplicity of the circuit breaker for working on the amp (that and the fuse holder I got is pretty big). Now, how should I go about fusing the whole system? I know I need a fuse from the alt to the bat (stock battery for now...it's brand new so I'm not buying a new one for a while), but what amperage? Also, would I be ok to run the circuit breaker I have now? Or do they make different sizes to match the gauge of the wire?