Trailer Lights

[66 vettster]

Have a problem with my 06 F350 Powerstroke. I insert my trailer plug and all of my running lights come on, this is without the light switch in the on position. The wiring seems to check out ok. Any ideas??

[super_stroke]

sound's like you have an elec. issue.




i know, i'm a smart a$$.




does ford use day time running light's? i dont think they do. did you replace the plug on the trailer end? may have gotten wire's mixed up if you did. i dont know. sorry boss.

[New2diesel]

Is the light switch in the auto position, and its dusk? May be the running lights wire is touching the constent pwr wire. probably in the male connecter.

[mschn99]

Originally Posted by New2diesel

May be the running lights wire is touching the constent pwr wire. probably in the male connecter.

U hit the nail right on the head man....and i would almost bet your right about it being on the trailer side....since if it was on the truck side it would do it all the time.........Marc

[66 vettster]

Thanks for the replys, we have tryed the trailer plug with other
trucks and the trailer works fine. Have hooked my ford truck up to other
trailer and it does the same thing. Lights stay on in the off position even
with the key in the off position. I am going to have to bring the truck and

[66 vettster]

I will bring in the truck and the trailer and have them see if they can
find the feedback problem.

[66 vettster]

Finally found the problem with the trailer lights. As soon as you plugged in
the plug the running lights would come on without turning on the switch. It turned out to be a wire up front of the cab, they followed the wiring from the back and it ran up to the front. They disconnected one of the connections to see if it was in that section or up further. When they put the test light on it, it checked out front and so they plugged the connector back in and it worked fine. They thought that the connector had bad connection or water in connection. I hope this helps somebody.

[Stressed11]

Mine is doing the same thing, where is this plug and what does it look like?
Thanks

[66 vettster]

My 2006 F350 Super Cab with the trailer wiring problem finally got repaired. I thought I would pass this on just incase somebody has the same problem.
When I plugged in my trailer connector, my running lights would come on the trailer even though I had not turned on the light switch. When the RV repair shop did the installation on my 5th wheel hitch they drilled a hold in the left side of frame and they drilled through the wire harness. This was difficult to see because of the plastic that covers the wire harness. The technician that was diagnosing the problem did not see the damage. The third time I brought the truck back they decided to look at the wiring around where the
5th wheel brackets close to the wiring harness. Hope this helps. Thanks for everybodys input on this problem.