Posted by Steve@Advance on February 08, 2018 at 13:15:21 from (24.182.105.179):
In Reply to: trailer brake question posted by notjustair on February 08, 2018 at 09:44:50:
It's really not that complicated, just need to have a test light and start tracing the brake wiring.
There is a lot of miss information out there on the terminal designation of the plug, that and front view/rear view, truck end/trailer end. Just be careful you are wired correctly and tracing the correct wire.
Typically the blue wire is the brake, terminal 2 on a 7 way plug.
To get power to the blue wire, either block the brake pedal down, or if the controller has a manual over ride, block it over in the applied position.
The magnets are wired parallel, each has it's own ground, usually grounded to the frame at each wheel.
If the trailer was wired with the fold over quick connector wire splices, that is the first place to look. They are worthless, should be replaced with soldered and shrink tubes connections, or at least crimp connectors.
The break away battery should not be able to keep the brakes from working.
A very common place for failure is in the trailer plug. The wires get loose and pull out of the screw connectors. Also on the truck side, there is a battery connection that is always powered up. That is a common place for corrosion to grow, especially if it gets wet.
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