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Car Audio Discussion
General Car Audio
Grounding issue
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<blockquote data-quote="Thorin" data-source="post: 8792563" data-attributes="member: 685946"><p>It's a 2016 Ford Fusion, so should be considered unibody, I guess. In the meantime I pulled the battery, cleaned terminals and clamps and reassembled. The body ground was actually screwed into the shock tower wall as shown in the upper right of this photo.</p><p></p><p>[ATTACH=full]39053[/ATTACH]</p><p></p><p>I removed it and they hadn't even removed the paint, so I reassembled with bare metal. The wire in the upper left is from the battery post and it appears that is what goes direct to the body ground (it goes into a big harness, so not 100% sure). Not shown, but I also attached a second #6AWG from the battery post to the body ground with star washers.</p><p></p><p>Now in the trunk I get 0.1 ohms with the key off and about 13-14 ohms with the key in accessory. Something still isn't right. </p><p></p><p>I'm also getting about 9 ohms between the battery positive and the grounding bolt shown above. That's like 10" from the battery. I just don't get it.</p><p></p><p>Checked voltage between terminals and got 11.77V key off and 11.42 key on. In the trunk from the battery post to the trunk ground it was 11.77V off and 11.41 key on. So about .35V drop with accessories on. </p><p></p><p>Any ideas what could be screwing up my ground? Should I just say **** it and run a big ground wire from the engine compartment to the trunk? It's a real pain in this car, so I'd love to avoid that option.</p></blockquote><p></p>
[QUOTE="Thorin, post: 8792563, member: 685946"] It's a 2016 Ford Fusion, so should be considered unibody, I guess. In the meantime I pulled the battery, cleaned terminals and clamps and reassembled. The body ground was actually screwed into the shock tower wall as shown in the upper right of this photo. [ATTACH type="full" alt="39053"]39053[/ATTACH] I removed it and they hadn't even removed the paint, so I reassembled with bare metal. The wire in the upper left is from the battery post and it appears that is what goes direct to the body ground (it goes into a big harness, so not 100% sure). Not shown, but I also attached a second #6AWG from the battery post to the body ground with star washers. Now in the trunk I get 0.1 ohms with the key off and about 13-14 ohms with the key in accessory. Something still isn't right. I'm also getting about 9 ohms between the battery positive and the grounding bolt shown above. That's like 10" from the battery. I just don't get it. Checked voltage between terminals and got 11.77V key off and 11.42 key on. In the trunk from the battery post to the trunk ground it was 11.77V off and 11.41 key on. So about .35V drop with accessories on. Any ideas what could be screwing up my ground? Should I just say **** it and run a big ground wire from the engine compartment to the trunk? It's a real pain in this car, so I'd love to avoid that option. [/QUOTE]
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