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I think there is a way to calculate what size you need based on the length it has to travel. You only have to run the power wire, obviously, but I'd either run 4 or 2 if you can fit two. Downside is it can be heavy
you can pick up a battery box for about 10 bucks at walmarts. If I remember correctly to be legal it is supposed to be vented outsode of the car unless you run a sealed battery like a optima. But I am not 100% on that. while I was at it I would add a kill switch if you store the car for the winter. you can pick a kill switch up at harbor freight for a few bucks. as for the power wire I would run at least 4 guage. Remember to keep your ground short less than 2 feet is ideal and grounded to the frame is best deffinitly not to body panels! hope this helps some.
one last thing your ground and power wire have to be the same size.
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99 Ford F150 Extended cab 4x4
55 chevy 210 coupe 327ci Shoebox!