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DLW · 08-30-2018, 03:59 PM

What is the amperage of the stock alternator?
If its over 100 amps and your run is greater than 5 feet I would run a min of 4 gauge wire.

I run the same Ron Francis Express box myself but I did not use the starter as a Junction block for my LS3 install. I used a junction block like in the picture VetteVet shows, but I wired it different than his drawing since I have a cutoff switch and battery is mounted in the rear. Also it leaves room to hook other accessories up that need battery power and not over crowd the starter area/stud.

I for example used 1/0 AWG wire in my setup with a 175 amp alternator and 12 ft. runs of wire. Also, I used the same gauge for all charge wiring leading to the battery, maybe that's just me. I also used 1/0 for the grounds to the battery and frame rails.

08-30-2018, 03:59 PM	#7
DLW Registered User Join Date: Apr 2014 Location: Union City, CA Posts: 384	Re: wire gauge What is the amperage of the stock alternator? If its over 100 amps and your run is greater than 5 feet I would run a min of 4 gauge wire. I run the same Ron Francis Express box myself but I did not use the starter as a Junction block for my LS3 install. I used a junction block like in the picture VetteVet shows, but I wired it different than his drawing since I have a cutoff switch and battery is mounted in the rear. Also it leaves room to hook other accessories up that need battery power and not over crowd the starter area/stud. I for example used 1/0 AWG wire in my setup with a 175 amp alternator and 12 ft. runs of wire. Also, I used the same gauge for all charge wiring leading to the battery, maybe that's just me. I also used 1/0 for the grounds to the battery and frame rails.