I have a 97 150 that I bought used and it didn't come with a book. Anyone know what number fuse the signals are on the trailer?

 

I did these two posts a while back to help out with problems like this.
Fuses
Fuses

My truck didn't come with an owners manual either, so I bought one off eBay for $15. I also bought the Haynes manual, it only cost about $15 too; its just OK but it helps out.

Good Luck

 

You can buy an owners manual at the publisher. Go to www.helminc.com
They sell the factory shop manuals too.
Dave