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Old 12-13-2014, 07:47 AM   #1
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M.O.C. #7994
Brake Alarm

I had a TRAILER FAULT alarm on my built in trailer brake controller in my F350. Had the truck checked out, I checked out the trailer as much as I could. I'm somewhat limited as we are travelling and of course some otherwise usefull stuff is at home.
Truck checked out fine and they found the code C2808 meaning the fault, a short, most likely was in the trailer plus they had the brake oontroller tester and checked function.

As a pretrip test I usually use the controller slider switch to apply full brake and then step on the throttle to raise the engine to about 12-1,300 rpm. There will be a little movement untill the brakes hold and then no creep after.

Of course with the fault there was continual creep, to much.

To cut it short I had read this before on the MOC so I went with it.

Some of the wiring is run through the axle tubes and has been found to wear the insulation while driving. I pulled the wires out and ran them through electrical PVC conduit which I strapped to the outside. Reconnected the brakes and went out for a test run this AM.

No alarms and no creep when I did the pull test and the brakes work.

So if you do get a fault and the controller checks out ok then consider that through the axle wiring as a potential problem.

I did inspect the wire but could not find a worn spot. All it would take is a pinhole from a rust spike or rough patch to penetrate and there would be a fault and the hole would be almost impossible to find.

Thank You MOC or I would not have done it first, rather somewhere down the road.
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Old 12-13-2014, 01:23 PM   #2
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Good find!!!
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Old 12-13-2014, 02:33 PM   #3
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M.O.C. #11455
Glad it worked for you. Worn wires at the axle is a common problem.
Dick and Joyce, Wilsey, KS & Lakewood, NM
2017 3720 RL, MorRyde pin box
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Old 12-13-2014, 03:17 PM   #4
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Glad you have a fix. Brakes are critical.
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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Old 12-14-2014, 01:03 AM   #5
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Thanks for sharing.
2018.5 Montana 3791RD
2012 F350 SRW 6.7 PSD

Full Timing since September 1, 2010
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