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when dealing with electric, bigger is always better. especially when dealing with DC. also, if it is a sustained load you want to go bigger as well. No way i would run 125 amps through 10g wire. chances are you are not sustained amps, so any of your individual breakers should trip before you hit full current pull
I know industrial wiring, 10g is 30 amp wire, for 125 we use 2awg. granted this is 120-480v vs 12v, but an amp is an amp no matter the voltage. If it were mine, i'd use no less than 6awg on a feed such as that.
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beat up rusted out k5
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