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Message: <blockquote data-quote="Umbra" data-source="post: 8507460" data-attributes="member: 658055">Check out Crutchfield's guide: <a href="http://www.crutchfield.com/S-4fIrSo7DzdH/learn/learningcenter/car/cable_gauge_chart.html" target="_blank">How to determine the best wire gauge</a>They recommend 8 gauge (I'm making a gross assumption you're running from a battery in the front to a trunk in the back), but then again it's a conservative estimate and if you're not running that length then you can use a smaller wire.Trim as little of the ends of the 4 as you can to get a secure fit. If all but then ends of the wire are 4 awg thick it'll act more like a 4 gauge than a 10 in terms of amperage capacity</blockquote>

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