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Message: <blockquote data-quote="thevic24" data-source="post: 4329470" data-attributes="member: 575973">just dooing the ground wont be enough, the battery + to the alt + is very important as well as the motor to body ground.here is an example-- i have a stock 70amp alt in my bronco(1985) and i run a ppi a600.2(draws up to 60 amps) and a fosgate 500x(draws up to 40 amps). i did the big 3 upgrade with just 4 ga and even with the ac on i have no power issues at all. even cranking on it, my voltage never drops below 13.2v. befor you go any further, upgrade the other 2 wires.</blockquote>

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