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Message: <blockquote data-quote="helotaxi" data-source="post: 2543977" data-attributes="member: 550915"><p>Yeah, WAY under a half ohm.  At a half ohm you would get a half volt drop across your ground for every amp flowing through the ground path.  If you can measure the resistance of the ground that you choose directly with a basic DMM, it's not a good ground.The nut that the the seatbelt bolt threads into is usually held in place by some pretty good welds and is on the most substantial piece of metal in the car (not that that is saying much in many cases)I ground back to my battery but I also wired a small system with 1/0.  Total overkill in my case.  300W should be completely fine with a normal chassis ground.Actually that is totally backwards, the chassis is grounded to the battery.  The ground plane in a car is the negative battery terminal, not the chassis.</p></blockquote><p></p>

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