My brother called me to get his 4 flat wiring harness working so that he could take his boat out and do some fishing. I've found that the running lights work but there is no power to the stop/turn wires. I suspect a blown fuse, but he bought the truck used and doesn't have an owners manual so that I can locate the fuse. Any suggestions?

Even Though I dont Own A Ford This Is Something You Can Do With Any
Vehicle. It May Be A Little Time Comsuming But It Will Work. YOu Can
Pull Out Each Fuse One At A Time(Dont Forget To Remember when You
Pulled It From) And Look For Your Self And Sell If You Find A Blown Fuse.
Hope This Helps