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 > Another Electric Brake Problem Question???

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Hap Hazard

Mammoth Lakes

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Posted: 02/26/14 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

Need some fresh ideas and suggestions with an electric brake problem.

First the Basic:’12 ford F-250 with 6.7L diesel and Ford Tow/Haul brake controller. ’05 Weekend Warrior FSC2800 T/H with dual axles and electric brakes.

All Ready done or Tested: Dash indictor shows “Trailer Disconnected” and “Faulty Trailer Wiring”. Have already checked truck fuses and all appear good. All running lights, brake lights, turn signals and emergency flashers work. All trailer wiring look good at all connectors, no torn or cut wires, and all connections in the junction box appear tight. Used a "7" pin tester and all lights appear working. All four wheels have been removed and re-installed with wheel bearings re-packed, new seals, etc.

The problem: is I have no trailer brakes indicted and no indication of brake actions when brakes are applied either by pedal or with the controller.

The Question: Has anyone got any suggestions on how to narrow this down to a specific electrical or wheel problem? Are there points in the system that I can use a volt/Ohm meter to check for current (especially as I near the magnets)?

Thanks in Advance,
Hap

ScottG

Bothell Wa.

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Posted: 02/26/14 08:46pm Link  |  Quote  |  Print  |  Notify Moderator

Since it comes up with "Faulty trailer wiring" I suspect the problem is only with the trailer. If it had no connection it would say it wasn't connected but since it says faulty it knows it's connected. My guess would be there's a short in the trailer brake wiring. One of the most common problems is that the wire that runs inside the axle tube eventually wears through and lightly shorts to ground.
Simply wiggling this wire may clear up the problem temporarily (very temporarily).
If that's the case then a re-wiring is in order.


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the bear II

Torrance CA.

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Posted: 02/27/14 10:41am Link  |  Quote  |  Print  |  Notify Moderator

Try plugging in to someone elses known good trailer...that will show if the problem is the trailer or the truck.

chiefneon

Livingston, TX

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Posted: 02/27/14 11:01am Link  |  Quote  |  Print  |  Notify Moderator

Howdy!

You can check each wheel brake magnet by holding a compuss next to the hub and having someone apply the brake. The compass will react to the electric brake magnet. If it does not I would start there. I had this problem with a new 5er off the lot and it turned out the brake wires were crimped to much coming into the back of the backing plate causing a short.

"Happy Trails"
Chiefneon

Hap Hazard

Mammoth Lakes

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Posted: 02/27/14 11:02am Link  |  Quote  |  Print  |  Notify Moderator

Thanks folks for the feedback. Chiefneon, This is the type of trick I was looking for. I'll then know if I'm looking for a magnet problem or a wiring issue on the trailer side or on the truck side.

Does anyone know if you can simply plug 12 volts directly into the trailers brake cable terminal to provide electrical input, or does the brake controller vary the voltage depending on the pressure applied to the pedal.

* This post was edited 02/27/14 11:10am by Hap Hazard *

Jack_Diane_Freedom

Milton Ontario Canada

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Posted: 02/27/14 11:04am Link  |  Quote  |  Print  |  Notify Moderator

Make sure your IBC did not get accidentally set to electric/hydraulic.

stsmark

Northern CA

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Posted: 02/27/14 12:17pm Link  |  Quote  |  Print  |  Notify Moderator

Seems to me that you could do Chief's test (excellent btw) by pulling the breakaway on the trailer. Another simple test with VOM would be the on the trailer side of the plug to do continuity from the brake input pin to ground pin.


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stsmark

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Posted: 02/27/14 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

My Cyclone a meter and I were in the same spot and I had 1.2 ohms between the brake signal and ground 5 and 7 o'clock position looking at the trailer plug, ground is at 5. I have a 2011 Ford and brakes work great. Hope it helps, oh double axle.
Mark

vic46

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Posted: 02/27/14 12:54pm Link  |  Quote  |  Print  |  Notify Moderator

the bear II wrote:

Try plugging in to someone elses known good trailer...that will show if the problem is the trailer or the truck.


Do it the other way as the problem is likely in the trailer.


Never argue with an idiot. You will be dragged down to their level and then beaten with experience.


big buford

Buena Park, Ca

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Posted: 02/27/14 01:30pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

My guess would be there's a short in the trailer brake wiring. One of the most common problems is that the wire that runs inside the axle tube eventually wears through and lightly shorts to ground.


X2 happened to my 04. My thought is go ahead and pull the wires out of the axle tube. Upgrade(gauge)wire and zip tie to trailing side of axle tube. Much better to know it's done and done right, with a good possibility of fixing problem to boot.

My brakes never worked so good till after I did this mod.


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