Trailer Wiring

[rifleman625]

Hi,
For some reason when I connect my Expedition to my boat trailer only the right turn signal on the trailer works. When we connected my neighbors F150 to it, all the lights work correctly. Can someone please help? Thanks.

 

[mustangrfast88]

i would say maybe a bad fuse to the trailer sytem from inside the expedition if it all works on the other truck. maybe a bad contact on the traile plug on your truck . need alittle more info is it a 4 way flat or 7 way plug and is it factory or aftermarket

 

[rifleman625]

The trailer is a flat 4-way, my Exp is 7 way factory. Which fuses would they be? We used the same 4way-7way adapator on the F150 that I use on my Exp.

 

[mustangrfast88]

i would say it is the trailer package fuse then if all was the same and it aint working on your truck but works on another truck or a relay under the hood for the trailer package could of went bad

 

[rifleman625]

I don't have a manual. Is the fuse located in the black box under the hood on the left side. Which fuse or relay would it be? Thanks for you help.

 

[mustangrfast88]

i am off to work right now i work second shift i will pull the book out of the truck tonight when i get home and i will give you a answer and i am sure the fush is under the dash and the relay is out under the hood

 

[JUST4FUN]

you could use a test light to check the wiring on the truck
put some dieletric grease on the connecion