So somehow the trailer tow circuit is affecting the regular truck lights. Does your truck have a trailer wiring plug? How does it look back there, like a mess?

 

You should be able to locate the security module by checking your vehicles owner manual.

 

I'm pulling my hair out trying to find the solution to this problem. At first, it was sporadic. The running lights would come on with a good pothole but now they never come on. I don't think I have turn signals nor tail lights, either. I'm pretty sure it's a lose wire someplace, but where? Any ideas?

 

Your year has a common problem with the running lights. The wire they used to feed these lights to the headlight switch likes to over heat and melt. I would pull the headlight switch and check for a tan/white wire. You may find it melted, or the metal plug in where this wire is inserted in the headlight switch is melted, or you may have to hunt for this wire, it may be totally burnt off. This wire comes from the running light fuse and feeds the running lights and the cluster/dash lights in the truck. It has nothing to do with the headlights.

 

Well. For 2 years i had no running lights i did a lot of searching from seriously bumper to bumper. Pulled my entire dash relays GEM cleaned every darn connector and still no bueno. Ended up finding the brown wire that powers park lights had rubbed through the loom by the rear bed cross member by rear driver shock. Soldered new wire together wammy good to go

 

But your dash/cluster lights always worked correct? Unless it was blowing the fuse.

 

Thanks, Franklin, I'll look for that. Right now it's -32 with a -50 windchill, so I think I'll wait a bit.

 

Working on a 04 f650 rollback lost running light on rear while checking harness along frame must have shorted wire because now running lights on cab and dash are out. Any help would be great

 

See what fuses are blown out and report back. Till then I will see if I can find any diagrams on it.

 

Dash lights, reverse lights and tail lights do not come on at all. Break lights and headlights work fine. Husband checked all fuses and tested wires. We can't find the sorce of the problem.

 

I cannot find anything common with the exterior lights and the reverse lights, except the location of their wiring. It all passes through some connectors that are close to each other on the driver's side under the dash. I would inspect the wiring carefully, mice may have chewed through some of the wires over there.

 

try fuse #17 thats what mine was had already replaced the headlight switch $100 DTD checked the fuses with a tester and all looked good until I took them out one by one # 17 was it all is good for now hope this helps someone look at all the fuses before replacing expensive parts

 

I'm having the same problem if you got yours fixed what did you find

 

[QUOTE=jerrysrios;14930254]I need help please my tail lights parking lights and dash board lights stop working my turning signals work my brake lights work and my headlights work fine I checked all fuses are good I even switched out the headlight switch with a new one and nothing.what can this problem be can someone please help me[/QUOTE


did you find your problem?

 

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