Wiring Repairs

Wiring Repairs

There are 2 standard trailer plugs; 7-way RV and 4 pin flat.
7-way RV plugs are designed for trailers with electric brakes. These systems will usually have 5-7 wires in its harness
4 pin flat plugs are designed for a trailer that has basic lighting requirements.

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The common wires in a trailer lighting system are:

  • Running lights (taillights)
  • Stop/turn RH
  • Stop/turn LH
  • Ground wire

Systems that have electric brakes have the following additional wires:

  • Electric brake wire
  • 12V charge line

Common problems in electrical systems are, faulty connections, grounding issues, worn or pinched wires, burnt out bulbs, faulty lights and damaged or worn out plugs.

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