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![]() ![]() ![]() ![]() Drives: 2010 Yaris Sedan Join Date: Feb 2010
Location: Kansas
Posts: 871
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Yeah, Ive never understood the secondary ground, but they do it in home wiring too. So I usually hook it to the mounting bolt for the head unit, since it goes into the metal chassis of the car.
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| ground wire, grounding, wiring harness |
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