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Electrical wiring Trailer/Cab
Question on 7 flat pin wiring.
Trailer lights, brakes have been working. I would like to hook up backup light circuit and 12v circuit for in cab switch for under trailer spotlights.
When plug is not connected, I have 12vdc on correct pin,
When plug is connected no 12vdc at that wire in junction box.
No extra batt.or breakaway is installed.
How do I access the relays/control wire in cab?
Suggestions, direction, links that work, pics, diagrams, etc.,
I would like to gather info see what I should be seeing.
In advance, Thanks for any info.