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Pull Toy · 08-09-2017, 02:37 PM

If all braking is out, the problem is probably either the brake controller itself, or the trailer grounding. If it's intermittent, I'd bet on bad common grounding between the units. The controller is easy enough to check, they either work or they don't. Test it at the bumper jack, but you need two people. Use an amp meter, between the Trailer Brake and Ground. Have your helper apply braking power while you are on the pins at the bumper jack. You should see increasing amps, as the more brakes are applied. If this checks out... move to the trailer.

Most of the braking / ICC Light issues I've had over the last 50 years have been grounding issues. An easy way to check a frame grounding bond between TV and TT is to "hook up" and check for ZERO ohms between "truck frame and trailer" at truck bumper and trailer frame. If you get any reading other than ZERO, your truck and trailer are not electrically bonded, and you will have issues with exterior lights, brakes, and TT battery charging while "en route".

Good Luck,

08-09-2017, 02:37 PM	#12
Pull Toy Senior Member Join Date: Mar 2015 Location: Southeastern Connectiut Posts: 1,306	If all braking is out, the problem is probably either the brake controller itself, or the trailer grounding. If it's intermittent, I'd bet on bad common grounding between the units. The controller is easy enough to check, they either work or they don't. Test it at the bumper jack, but you need two people. Use an amp meter, between the Trailer Brake and Ground. Have your helper apply braking power while you are on the pins at the bumper jack. You should see increasing amps, as the more brakes are applied. If this checks out... move to the trailer. Most of the braking / ICC Light issues I've had over the last 50 years have been grounding issues. An easy way to check a frame grounding bond between TV and TT is to "hook up" and check for ZERO ohms between "truck frame and trailer" at truck bumper and trailer frame. If you get any reading other than ZERO, your truck and trailer are not electrically bonded, and you will have issues with exterior lights, brakes, and TT battery charging while "en route". Good Luck, __________________ Pull Toy Steve & Jan, Ava & Emma (Mini Schnauzers): 2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V" 2013 Alpine 3535RE "MAGIC CARPET IV" Proud Navy Vet!