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Old 08-04-2016, 05:02 PM   #1
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need some ideas on trailer brake issue...

I'm hoping someone here can offer some input as Im at a loss. While returning from MI last week my ITBC display flashed a message that I had lost trailer braking. Upon arriving home, I was able to determine that there was no voltage output at the trucks 7Pin connector. I just picked it back up from the dealership last night, who replaced the trailer brake relay, and upon plugging back up to trailer today, everything seemed ok...trailer connected displayed and upon pressing the brake pedal, the output level increased...until it apparently blew the relay again. Im back to no output, no brakes. Does anyone have any ideas as to what could be happening to cause this relay to fail? Ive looked at all brake wiring and connections to verify nothing is disconnected/broken but im no longer certain that its a problem stemming from the truck...although it is now as the relay has failed again. Has anyone seen this? Any suggestions before I haul the trailer back to the dealer to see what they come up with?
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Old 08-04-2016, 05:17 PM   #2
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Are you sure the relay is toast and it's not just a blown fuse?

It would help to know what vehicle you have and if it's a built in controller.

You may have a shorted magnet or wiring on the RV.

Start by tracing the brake wiring from the umbilical cord back to the brakes. Look for any place where the wire goes over or through a piece of metal. (frame, axle, etc.).

If you know how to use a multimeter you can check each magnet for a short. Each magnet should read between 3 and 4 ohms.
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Old 08-04-2016, 05:22 PM   #3
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Quote:
Originally Posted by Bama Rambler View Post
Are you sure the relay is toast and it's not just a blown fuse?

It would help to know what vehicle you have and if it's a built in controller.

You may have a shorted magnet or wiring on the RV.

Start by tracing the brake wiring from the umbilical cord back to the brakes. Look for any place where the wire goes over or through a piece of metal. (frame, axle, etc.).

If you know how to use a multimeter you can check each magnet for a short. Each magnet should read between 3 and 4 ohms.
I would agree, wiring first then pull the brake drums off the trailer and check the mags.
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Old 08-04-2016, 05:41 PM   #4
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Trailer Brake System!! - Chevy and GMC Duramax Diesel Forum

https://www.etrailer.com/question-122398.html

Read this, it may have something in it too help?

Have someone hook up to your trailer and see what happens, if all is good then there is an issue with your truck or if not then its the camper.
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Old 08-05-2016, 03:45 PM   #5
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Originally Posted by bluewoo View Post

Have someone hook up to your trailer and see what happens, if all is good then there is an issue with your truck or if not then its the camper.
Or they will blow a fuse in their truck
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Old 08-06-2016, 12:40 AM   #6
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Some electric brakes use metal clips to hold the wiring to the electromagnet assembly and it is not unusual for these metal clips to wear thru the wire insulation it is holding and cause intermittent shorts....ask me how I know!

Another spot for shorting is wiring is often routed into the axle thru a small circular opening. This opening often has a rubber washer that protects the wiring from sharp edges and this sport can be a source of a short.

Good luck!
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Old 08-06-2016, 09:18 AM   #7
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I found I had no trailer brakes, Come to find out the main wire to the first drum was run down off the frame under the water tank cross member . Resting on top of the axle. Must of hit a bump big enough to make the cross member and the u bolts touch. Pinching the wires . Cut one in half. I now ran them along the frame and dropped in behind the axle. Maybe this could be your issue as well.
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