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I am thinking about relocating my battery to the rear of the car, but what guage wire should I use. I know there is a formula for calculating the gauge based on distance from the source, but I don't know what it is. I don't have a high power system or anything so the smallest proper guage should work fine. I will probably just put in a breaker box or something to attach the current terminal wires to the ones I will use to run to the rear of the car. Also, should I run the current ground from the terminal, or should I just ground it in the rear of the car? Does anything else attach to the negative terminal that would makes this difficult or so I just relocate the battery and ground the battery to the closest source? By the way I am moving the battery for better weight distribution and handling, not for a system or anything.
 

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4 gauge should be fine, you could go bigger if you wanted to be safe and spend more money.
 

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Ground the battery in the rear.

some kits come with 4 gauge wiring to relocate the battery... but i dunno, i'd go with 2 gauge or 1/0 even. i say more is better. you never know, someday you might wanna put an amp back there.
 

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I'd use atleast 2 gauge but 4 should work
and put a circuit breaker back there for it
 

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With 4 gauge I had trouble starting my old car in the winter. I went to 1/0 and the issue went away.
 
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