Ok here is the deal I hope someone can help me!!! I haave a 05 F150 Screw Cab with the towing package on it. I have a 24ft enclosed trailer that has interior lights on it. before I had the f150 I had an 01 expedition and pulled this same trailer and the lights worked perfectly. The dealer is telling me I may not have a fused plugged on or I need to purchase relays to get 12volts to the plug. Does anyone know if it is just a fuse or relays I need? From what the dealer explained is that the truck shoudl be wired and I just need to plus in a fuse or relays...Please help it really sucks trying to pull in my car with a flash light!!! Thanks in advance

 

Should be a fuse (I think). Relay is for the trailer brakes. Check your owners manual for the fuse location. ALso, for the interior lights to work, your key has to be in the "on" position. Do any of your trailer lights work? Brake lights?

 

yes all of the exterior lights work brake lights turn signals etc etc all work...it is just the interior lights and now that you mention the relay for the trailer brakes I have been wondering why it take forever for the truck to stop because the trailer does have electric brakes!!! And yes the dealer did tell me the key needs to be in the 'on position'...Any idea what those relays cost?

 

The relay that most F150's are missing costs less than $20.00, if I remember correctly. It provides 12v power, such as to charge a battery on a travel trailer. If your wiring from the trailer makes use of this pin to provide lights for the interior, it would explain why you don't have power if the relay is missing. The location for the relay is in the fuse panel by the passenger's feet.

Electric braking for your trailer is provided through an independent brake controller. This is a separate unit F150's need, such as a "Prodigy" or "Voyager." Do you have one? The wiring is under the dash to plug one in. Newer F350's have them built in, but F150's don't.

Don

 

ks for the info all..FYI it was relay#5 that is need for the trailer interior lights. One of my softball teammates works at a ford dealer and got me all fixed up!!! and Don I just saw the braker controller plus when I got under the dash so I will definetly look into gettin a Voyager had good luck with that one on my expedition.

 

I got all the relays and fuses needed in the glove box of my truck. The dealer gave me the package on delivery

 

Same here my 08 had a bag in the glove box with wire and relay

 

my dealer sucks in that case!!!! I will call my salesman and give him an ear full!!!!