the is no fuse it is a flasher relay most likely located up under the dash on the drivers side Ther are also fuses for both flashers and turn signals. The following link will take you to the owner manual and the fuse chart (pg. 279) http://www.analogstereo.com/pdf/om/mustang_owners_manual_1996.pdf
It should be in slot# 5 in the fuse box located on the lower driver's side. It requires a fuse 15A.In a 94-98 Mustang, the fuse should be located in slot #1 of the instrument panel fuse box. It contains a fuse amp rating of 15A. 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.
Fuse box located under dash drivers side .Fuse *5 15 amp Fuse
Left side dash panel, fuse number 4, 14 amp.
Checkturn signal flasher
I believe it is mounted in the fuse box
look on the fuse box, if not your owners manual will tell you
it should be number four, a fifteen amp fuse
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
On a 1996 Ford Bronco the turn signal flasher is plugged in to the fuse box
Turn signal flasher Try in or near the fuse box
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
It is in the top right hand corner of the fuse pannel. It will be about 1" in diameter and 1"-2" in height.