Hi
I have a 2004 F150 supercrew, the trailer lights stopped working. I have check and replaced the 201 Relay still no go. I don't have running or brake lights on it. Any ideas?

 

Bad ground on the trailer.

 

I know that on my 06 there is a separate fuse for trailer lights if you have a tow-package. The same thing happened to me back in the summer. 20amp fuse. Look inside your owners manual and it will break it down. G/L

 

Thanks for the response. I know it isn't the trailer because I first noticed it when the lighted hitch plug wasn't working. Then hooked a trailer up to it and it didn't work but it did on another vehicle.
As far as the 20 amp fuse, looking in the book I found 3 separate fuses for the trailer lights left turn, right turn and the 201 Relay for lights. I suspect there is another one floating around somewhere. Do you remember if it was in the fuse box or elsewhere?