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135i
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By what you sad. EW that ground. I soldered mine near my tire well, near the rear right tire. Just have to be bare metal (scrape that paint off!) and use a nut and bolt.
 

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135i
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909 Posts
Solder it or bolt it. I just soldered it because I didn't want to create a hole in my car. You need to have it on the floor of the car, or trunk area or an area on the floor that is flat and not allot of layered metal.
 
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