You have to have a clean metal surface so go to your ground and SAND the paint and all off. Also as far as I knwo and all the head units I have put in the z's there is not factory ground wire that is used in the aftermarket harnesses. So I would check on those if you did somehow use the factory ground unhook that wire and ground it to one of the 4 bolts were the shift knob is. But the most important thing is to sand that primer and paint off that ground spot.
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