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  1. #1
    New Member
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    Jun 2020
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    Need help locating 3950BH-R 7pin wire path from pin box back

    Hi all,

    I've completed the first phase of a 24V electrical upgrade on my 3950BH and need to locate the 7-pin trailer harness somewhere inside the RV once it disappears up inside the pin box. I plan to trace down the 12V+ provided by the tow vehicle and feed it in to my Victron 12-24 Smart Charger to continue using this power to keep my batteries topped off while driving.

    Does anyone know where this may end up? Maybe the trailer lights break off immediately and the +12 goes somewhere I can isolate it?

    Scott

  2. #2
    Setting Up Camp
    Join Date
    Jun 2020
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    The 12 vdc from Tv should go to the battery for charging. The other pins are supplying 12 vdc to the lights ( running lights, left turn, right turn and Brakes ) that returns to a common ground.
    2020 Chevy Crew Cab RST
    2020 Transend 30RBS

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