Trailer lights?
Thread Starter
Senior Member
Joined: Jul 2012
Posts: 355
Likes: 7
From: Central Illinois
Trailer lights?
My 07 5.4 xlt for some reason the trailer tail lights do not work. The brake and turn signal lifts work just fine just not the running lights. And I know it's the truck because we hooked the trailer to another truck and they worked just fine. Is there a separate fuse or relay that just runs the taillights? Because I didn't see one listed in the manual
Senior Member
Joined: Feb 2012
Posts: 452
Likes: 34
From: Western Mass
My 07 5.4 xlt for some reason the trailer tail lights do not work. The brake and turn signal lifts work just fine just not the running lights. And I know it's the truck because we hooked the trailer to another truck and they worked just fine. Is there a separate fuse or relay that just runs the taillights? Because I didn't see one listed in the manual
Professional Amateur
Joined: Mar 2012
Posts: 40
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From: Southern California
Try fuse F10 its a 20 amp fuse. I had some issues with one of my trailer turn signals/brake lights not working and it was just a blown fuse. I had the OBDII port and cigarette lighter go out at about the same time. Both were frustrating but were simple fixes.
Relay 201 also controls the trailer parking lamps, which I'm assuming also control running lights.
Below is the link for the owners manual that give you the numbers for fuses on 299. This was very helpful in figuring out which fuse it could be without pulling them all. Hope this helps!
http://www.fordservicecontent.com/Fo.../08f12og1e.pdf
Relay 201 also controls the trailer parking lamps, which I'm assuming also control running lights.
Below is the link for the owners manual that give you the numbers for fuses on 299. This was very helpful in figuring out which fuse it could be without pulling them all. Hope this helps!
http://www.fordservicecontent.com/Fo.../08f12og1e.pdf
Moderator (Ret.)
Joined: Sep 2008
Posts: 9,460
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From: Lake Mary Florida
7 pin connectors...
I've done 4 of these on my trucks, including ebrakes. I'll agree with the OP that it's an issue with the truck side. If the wiring is old, contains crimps, or if the connector at the truck side is old, I'd spend one weekend day and unwrap everything at the connector, and either redo or replace it. The constant plug/unplug eventually will cause wiring or the pins to get a lousy connection. Another reason why I avoid using crimp connectors; always solder and heat shrink these connections.
Fuses do not go bad, they blow due to an overloaded amp draw. Loose, dirty, or high resistance connections all can cause a circuit to blow its fuse.
I've done 4 of these on my trucks, including ebrakes. I'll agree with the OP that it's an issue with the truck side. If the wiring is old, contains crimps, or if the connector at the truck side is old, I'd spend one weekend day and unwrap everything at the connector, and either redo or replace it. The constant plug/unplug eventually will cause wiring or the pins to get a lousy connection. Another reason why I avoid using crimp connectors; always solder and heat shrink these connections.
Fuses do not go bad, they blow due to an overloaded amp draw. Loose, dirty, or high resistance connections all can cause a circuit to blow its fuse.
Last edited by Mod (Ret.); Apr 24, 2015 at 04:53 AM.