Owner's manuals can be downloaded for free directly from Ford.
Go to www.fleet.ford.com
and look under the heading of MAINTENANCE.
Bulbs have two filaments, one for the running lamps and the other is for the turn/stop lamp function. There is no separate fuse for this function. You likely have a bad bulb. Replacement instructions are in the owner's manual.
If your original owner's manual is missing, download a soft copy from www.fleet.ford.com
under the MAINTENANCE tab.
1995 Mustang GT Convertible, only 68K miles.
200 Ford Contour Daily drive.
2001 F250 SD, 6.8L, 4 X4.
2007 Mercury Mariner AWD - Wifey's daily driver