I need some help installing a 2nd battery

[DFWFO]

I just put in a new alt and im trying figure out the best way to power all my acc(lights, amps, gps, cooler, etc.), ive never done this before. I was plannig on putting it in the back, inside the body panel. And its going in a 85 4runner. do i just run a like a 12gauge wire to the alt? or will it burn it up? and is it logical to run a master switch from there to the front of the cab? im open for anysuggestions at all. Anybody? thanks!

[86bobbedtoy]

I would atleast run a 4guage if not 2 or lower, thats a long way to carry current.

[Hawk Thor]

Run 2 gauge or bigger for sure, I´d also put a diode isolator to keep them seperate so that the accessories won´t drain your main battery. That way you can always start your truck even when the 2nd battery is flat.

[79coyotefrg]

going that far its gotta be a BIG wire with lots of strands,

[DFWFO]

ok, sounds good, but where did connect the wire at though? is it that red wire on the back of the alt, or do i run it from the main batt? and another stupid question, how do i post a pic of my ride? im a new guy and im getting iritated? thanks guys

[86bobbedtoy]

I would put a super heavy duty one from the alt to the 1st battery and run off there,
you can ground it to the frame, but then again run an extra ground from the motor to the frame to the body.