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03-04-2015, 07:43 AM
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#1
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1 Rivet Member 
Join Date: Aug 2003
Posts: 6
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Factory Brake Contol Warning
I have a 2005 Ford with the factory tow package option, and it worked well for some time, however, it is starting to display error messages (trailer fault/check wiring) and we have had the trailer power cord and the truck end replaced with no success.
Was wondering if anyone had this same situation? Is there a way to diagnose the controller on the tow vehicle?
Can a 12v coach battery if there is a defective cell in battery, for example) enter into this problem?
Would appreciate any input you may offer.
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03-04-2015, 08:19 AM
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#2
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Rivet Master 
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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Since it appears you have a trailer i would question the use of the word coach. Are you referring to your truck battery or trailer battery?
If the truck battery is in question I would test the voltage while the truck is off. If low just swap it out with a good battery for a test. It is hard to say what lower voltage might do to a piece of electronic gear like a controller.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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03-04-2015, 08:54 AM
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#3
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3 Rivet Member 
2010 28' Flying Cloud
Escondido
, California
Join Date: Feb 2007
Posts: 196
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Check your connections at the backing plates, insure the connections are secure.
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03-04-2015, 10:35 AM
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#4
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2 Rivet Member 
2002 30' Classic
Ocala
, Florida
Join Date: Nov 2005
Posts: 82
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Check your trailer brake wiring to each trailer wheel, may be a pinched wire or a break somewhere. Other 2005 F250 owners with same problem traced cause to wires. Once repaired message no longer appeared.
Here is quote from Ford-trucks.com website "mine did the same thing it would say trailer fault whenever you hit the brakes and sometimes trailer disconnect but the lights would work fine and this was on a brand new trailer so I hooked a buddy of mine trailer up to it and it worked perfect so I traced my brake wires from the tongue back to the axles and found out that one of the wires had been pinched in half and the other was smashed inbetween the trailer floor and the side frame after I spliced the wires back together everything worked perfect"
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03-04-2015, 11:14 AM
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#5
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Rivet Master
2013 30' Classic
Greenwood
, Mississippi
Join Date: Oct 2012
Posts: 12,111
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Quote:
Originally Posted by HowieE
Since it appears you have a trailer i would question the use of the word coach. Are you referring to your truck battery or trailer battery?
If the truck battery is in question I would test the voltage while the truck is off. If low just swap it out with a good battery for a test. It is hard to say what lower voltage might do to a piece of electronic gear like a controller.
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Why question the use of the word coach?
__________________
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
TAC #MS-10
WBCCI #1811, Region 6, Unit 56
Airforums #70955
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03-04-2015, 02:03 PM
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#6
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1 Rivet Member
Join Date: Oct 2014
Posts: 9
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For the contects between the trailer and the truck I always spray both with WD40.
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03-04-2015, 03:53 PM
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#7
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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Quote:
Originally Posted by m.hony
Why question the use of the word coach?
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A coach can be either a motor home or a trailer, but a trailer is always a trailer.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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03-04-2015, 04:54 PM
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#8
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Rivet Master 
2005 28' Safari S/O
Paradise
, California
Join Date: Jul 2006
Posts: 3,446
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Quote:
Originally Posted by FSoper2378
I have a 2005 Ford with the factory tow package option, and it worked well for some time, however, it is starting to display error messages (trailer fault/check wiring) and we have had the trailer power cord and the truck end replaced with no success.
Was wondering if anyone had this same situation? Is there a way to diagnose the controller on the tow vehicle?
Can a 12v coach battery if there is a defective cell in battery, for example) enter into this problem?
Would appreciate any input you may offer. |
Agree with the above posts about checking the wiring at the backing plates on the trailer wheels, I had a short in mine that caused this issue with the Ford IBC on my 2006 F250.
__________________
Steve
"THE OLDER I GET, THE BETTER I WAS"
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03-04-2015, 10:59 PM
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#9
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New Member
1973 31' Sovereign
wolfforth
, Texas
Join Date: Jan 2015
Posts: 4
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Quote:
Originally Posted by BillbB
For the contects between the trailer and the truck I always spray both with WD40.
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Would advise against wd 40 around wires. Know of a case where it cost a several thousand $$ set of aircraft radios. I am aware it is a water dispersant. (Sp). Would advise us of a good contact cleaner. Goodluck.
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03-05-2015, 10:12 AM
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#10
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1 Rivet Member
Tupelo
, Mississippi
Join Date: Apr 2014
Posts: 12
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Good customer of mine was having same problem with his 5th wheel. Finally traced it to the brake wire that Dexter had run through the axle tube. Over years of the wire bouncing around inside the axle tube, the insulation had worn away and was causing it to make contact with the inside of the axle tube, thereby creating more resistance which the brake controller read as a fault.
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03-08-2015, 04:17 PM
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#11
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4 Rivet Member 
1966 28' Ambassador
Vintage Kin Owner
Mobile
, Alabama
Join Date: Jan 2009
Posts: 259
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If the messages are appearing with trailer disconnected, the controller had probably gone bad. Fairly common problem I understand with 2005 model ( mine included). There is swap service for rebuilt one on eBay for $99 which I'm going to do soon (haven't gotten around to removing).
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10-03-2016, 11:56 AM
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#12
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2 Rivet Member
2004 30' Classic
San Antonio
, Texas
Join Date: Oct 2016
Posts: 95
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I recently had the same problem with the connection from the trailer and the 7 pins extension connected to my Ram truck. It seems water entered the connections and caused a short which in turn showed as a brake disconnect . A little wd40 and liquid tape corrected the problem. It seems water migrated into the connection. The give away was the flickering of the connect notice on the dash.
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10-04-2016, 07:54 PM
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#13
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4 Rivet Member
2016 25' Flying Cloud
Holly Springs
, Mississippi
Join Date: Sep 2015
Posts: 426
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Just had a very similar problem. Banner said "Wiring Fault on trailer." Also got a "Trailer disconnected" when it wasn't. It was the trailer controller module. Ford dealer charged $750 for a new one. If you can get a rebuilt one on eBay for $99, now that's a plan!
__________________
Bob
2016 FC 25' FB twin
2013 F-150 Lariat CrewCab 3.5 EB 4X4 3.55 axle
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10-06-2016, 08:28 PM
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#14
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4 Rivet Member
1966 28' Ambassador
Vintage Kin Owner
Mobile
, Alabama
Join Date: Jan 2009
Posts: 259
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I can report back that the $99 rebuild on eBay worked and resolved my controller problems.
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