Posted by Steve@Advance on December 01, 2019 at 18:35:37 from (66.169.147.211):
In Reply to: Trailer brakes. posted by ews on December 01, 2019 at 15:57:24:
JD is correct, that is a sensing current to tell the controller there is a brake connection made.
It has to do with turning on the "OK" connection light and/or sensing a short.
Wire it per the diagram, it should work.
When wiring a trailer from scratch, I like to run a brake wire and designated ground wire to the center of the trailer between the axles, then branch from there with equal length brake and ground wires. That applies equal power to each brake.
Trailer wiring is exposed to some of the worst conditions, vibration, water, snags...
I use soldered connections with liquid tape and shrink tube, tie everything up, protect the wire as best as possible.
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