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If you are tapping your 12v from one of the small guage power wires back there, try this:
Connect your 12v directly to the power block at the back of the spare tire well. Then connect your ground to the grounding block on the floor of the well, or another very close bolt that is unpainted. Make sure you are using heavy guage wire such as 4awg.
That will take all of 10 minutes to do, and will tell you if it is a current problem or not.
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