I have a 98 F150 Supercab and I cannot get the turn signals on the trailer to work or the brake lights...I've checked every fuse imaginable and however the running lights work...Again this is only a problem on the trailer not the truck...the problem is I've hooked up multiple trailers each show the same results...any suggestions?

 

Did you check the fuses in the small fuse block under the hood, on the left fender well area. It is probably covered with electrical tape. The block is about 1" wide x 3" long.

 

I found the 1" by 3" long box but how do I know which fuse does what...theres nothing in the owners manual...also how do I check these rela/fuses...there solid black (not your typical see through fuses)...thanks

 

Yankee7985 hit the nail on the head:

here it is at ( with the top off, red base ) :


The fuse layout :


The fuse to be replaced is the yellow fuse that you see in the picture above.

 

My truck is differnent than the model shown above...mine is a 98 and there is no fuse box like the one pictured above...any other ideas?? thanks...

 

correction I over looked the it...

It was a fuse in the mini fuse box!!!!!!! thanks for the help guys!!!

greatly appreciated!!!!!!!!!!!!

 

I was going to ask WTF. The picture of the green truck is a 1998 MY F-150.
That is from when I learned, Ford did a rubbish job on the 1998 Owners manual, and it still had the Mini Fuse box from the 1997 in it. Don't know why, but your owners manual ( 1998 ) is short this information. The manual page is from a 1997 MY truck. If you want, you can download the PDF of the 1997 Owners manual, and print that page, and insert it in your owners manual, so you have it with you.

Glad Yankee7985's information was useful to you.