Dave:
Remove the fog lamp lens and bulb. Start the T-bird, and use a trouble light or multimeter to see if you are getting current to the contacts in the bulb socket. Ground the instrument negative lead to the outside of the bulb socket and (carefully) touch the positive lead to the contact at the bottom of the socket (don't touch the outer shell of the socket with the probe or you'll short the circuit and blow the fuse. If there is electrical current getting to the contact, the bulb is not seating properly so the contacts on the bulb are not meeting the contacts in the bulb shell. If there is no current getting to the contact, there is a broken wire or a blown fuse somewhere in that circuit. I usually find that the bulb is not contacting the contact at the bottom of the socket, or the contacts are dirty and need to be cleaned (that includes the socket shell). Do that cleaning with the motor shut down. You can (carefully)push the wires into the shell and pull the whole contact board out of the bulb socket to clean the whole shebang.
SOURCE: replace the fog light bulb.
you don't. you disconnect the wire on the back of the light assembly and then the bulb twists counter clockwise and pops out, to re-install reverse the procedure. the wire is accessible from below the car under a black plastic flap the pulls down out of the way directly underneath the fog light.
SOURCE: 2002 Yukon XL - No Headlights
Check the headlight fuses in the engine fuse box compartment. Not sure if the lights have relays, but they will be clearly mark in the inside of the top cover for location.
SOURCE: 99 dakota fog lamps wont work although headlamps still work.
Check the relay to the fog light, it's the fuse and relay box under the hood behind the battery. Take the relay out labeled fog light and switch it with an other relay for now just to see if it is the relay, it the fog light's work then it's the relay. If they don't work then it's the switch, good luck and hope this helps. Keep me posted, be glad to help.
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