i'm in the process of installing a 3g 150 amp alternator in my 86 gt. i've wired it like jrichker suggests. what size fuse should i use? i'm using 4 ga wire
I would try to use a 125 amp fuse, as 4 AWG is good for around 130 amps at the distance you require. It would have been better to use 2 AWG, as that's more appropriate for the hypothetical load, and allows the circuit protection to better match the alternator's output.