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Wiring the connection at the trailer hitch

Wiring the connection at the trailer hitch 2022-12-14

The Hitch in Trailer Wiring.

When working on a trailer, the electrical interface between the trailer and the tow vehicle can present special issues that must be understood and delt with in order to prevent problems
  • The 7-Pin connector can not handle the current used in alternator charging
  • The 7-Pin connector connects several critical safety signals that must continue to operate.
    • Electric brake controls
    • Brake lights
    • Running lights
    • Reverse lights
If the user is not careful, they can create situations where these functions do not work and/or create a
fire hazard.​

Appendix A & B of this paper show the typical wiring and the common pinouts of the 7-pin connector. However, this paper does not attempt to describe how to wire the 7-pin connector. Instead, it discusses issues around the 7-pin connector that trailer electrical upgrades may run into and how to avoid them.
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Even a noob like me can understand this. Thank you.
As usual, another well thought out and well written paper by FilterGuy!
Very good for cross-checking my set-up. Lots of good information and details which many may not think of.
The PDF is well done
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