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7 pin trailer connector

  1. pin 4 of 7 pin trailer connector

    Electrical
    Hello, I am new to the forum with an electrical question. Concerning the 7 pin trailer connector, I know pin 4 is the power to charge camper batteries. My question is "What, if anything, is in the circuit between pin 4 and the truck battery besides the 40 amp fuse?" A link to a wiring diagram...
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