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Old 03-17-2018, 09:00 PM   #1
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911 No brakes

Normally would not be an emergency but I am supposed to leave in the morning with the fiver for a new job. Long story short I jerked the 7 wire loose from the junction box on the hitch. I have reconnected it the best I can think of and everything works just no brakes. All lights work and the truck is saying to service trailer brakes. I plugged into my flatbed and got the same error. I unhooked the battery and then reconnected and I had brakes on the flatbed. Pulled back over to the fiver and boom same error.

Please help - Supposed to leave in 6 hours!!!

Vehicle details below.
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Old 03-17-2018, 09:08 PM   #2
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Possibly fuse blown in fuse box under hood.
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Old 03-17-2018, 09:58 PM   #3
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Quote:
Originally Posted by Locky View Post
Possibly fuse blown in fuse box under hood.
Thanks - checked that all good - even changed it out with a new one just to be sure.
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Old 03-17-2018, 11:13 PM   #4
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Reading on the issue, the only DIY solutions are to check all the lights, and pull the 7-pin connector out from the back of the housing and apply dielectric grease to the factory harness/7-pin adapter. If it continues, looks like it is a dealer repair.
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Old 03-17-2018, 11:30 PM   #5
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Check that you connected the wires in the j-box correctly. Here's some pics that may help.
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Old 03-18-2018, 12:21 AM   #6
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I had this issue with my truck (2015 2500HD) and it was intermittent. Took it to dealer and they changed the trailer brake controller under warranty. No problems since.
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Old 03-20-2018, 12:27 PM   #7
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Did you ever get it straightened out? Inquiring minds want to know.
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Old 03-23-2018, 11:26 AM   #8
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I'm guessing he limped it slowly to a trailer shop that morning, then got on the road after repaired.
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