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Find a good spot where you can get the metal surgically clean on both sides…not even a hint of paint or primer. Then sand your ground lug to make sure there’s nothing on it and use a star washer between the lug and grounding point…they really dig in when you tighten the bolt…and use a bolt, not screws. I use fender washers on the bottom side with a lock nut on the bolt then I seal the bottom side with silicone to prevent rust and contamination. The one I did in my new car yesterday used a 10mm bolt.
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