This fuse is for: Turn Signal and Back-up lamps, airbag module, DRL module, Heated backlight relay coil, convertible top relay coil, etc...
This information was retrieved from the 1996 Ford Mustang owners manual which can be downloaded from Ford's website for free. I noticed they only had owner manuals for Mustangs that date back to 1996.
I believe it is mounted in the fuse box
Left side dash panel, fuse number 4, 14 amp.
The 1998 Ford Mustang owners manual shows : fuse # 13 - 15 amp - electronic flasher fuse # 18 - 15 amp - electronic flasher which fuse is for the turn signal flasher and which fuse is for the hazard flasher it does not specify
look inside the fuse box inside of the car it will be a round fuse that is about the size of a quarter near top left of fuse box
Fuse panel. Look in your owner's manual.
I found it under the steering column.
Fuse box located under dash drivers side .Fuse *5 15 amp Fuse
13
look on the fuse box, if not your owners manual will tell you
Fuse #7 is the turn signal circuit. 10 AMP. 2nd fuse fron the left in the 2nd row from the top.
in the fuse box, its numbered 22 and is a 15 mp fuse
Check fuse and turn signal flasher relay.