You need a better ground, the closer your ground wire is to the frame the better. It has to be connected to the frame one way or another, wither it be a steel part of your interior, or ran directly to the frame and bolted on a clean surface tightly, it should work better.
Answers & Comments
You need a better ground, the closer your ground wire is to the frame the better. It has to be connected to the frame one way or another, wither it be a steel part of your interior, or ran directly to the frame and bolted on a clean surface tightly, it should work better.