When I am towing my new 5er and the plug in plugged into the bed or the bumper plug I intermittently get a wiring fault on trailer or trailer disconnected? Everything seems to be working fine when this happens???

 

what truck? on the 08 like mine, this can mean a bad battery in the trailer. they don't have enough messages to be specific..

Sam

 

I have a 08 F450. Brand new trailer.

 

here is the text from the manual, I had some wires loose in the connector at the trailer which caused me intermittent trailer disconnected messages, this never caused a problem when towing with my suburban or F150. I opened the connector and reseated the wires and tightened the lock screws..
sounds like there is a problem with the in bed wiring cable into the standard harness.

TRAILER FAULT (if equipped): Displayed if there is a short circuit on the electric brake output wire or the trailer brakes are drawing too much current. Refer to Integrated trailer brake controller in the Tires, Wheels and Loading chapter for more information.

TBC FAULT (if equipped): Displayed in response to faults sensed by the trailer brake controller (TBC). In the event this message is seen, please take your vehicle to an authorized dealer for diagnosis and repair. Refer to Integrated trailer brake controller in the Tires, Wheels and Loading chapter for more information.

TRAILER DISCONNECTED (if equipped): Displayed when a trailer connection becomes disconnected, either intentionally or unintentionally, and has been sensed during a given ignition cycle. Refer to Integrated trailer brake controller in the Tires, Wheels and Loading chapter for more information.

Sam