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    Separate ground to rear of truck for aux. power panel

    Thanks. That is what I thought but wanted independent assurance.
  2. 1

    Separate ground to rear of truck for aux. power panel

    Question! I have an onboard Viair compressor mounted in the bed of my Pro 4X that I want to power up. I’m running #4 awg. from the hot battery terminal through a 30 amp circuit breaker, 40 amp relay to the bed. The #4 isn’t a problem, but do I need to run a separate negative lead back there or...