i had the same problem with my Jeep. it ended up being the switch, but there are many other problems that can cause your fog lights to not operate properly. check first to make sure they are not burnt out. then i'd check all your connectors to make sure there is no corrosion and that they are making good contact. next step is to put a meter on it and see if you are getting power to the lights. if not you've obviously got an open or a short in your wiring somewhere. check for a broken wire, faulty switch, etc.
The fuel pump is in the gas tank on a 1999 jeep Cherokee sport.
It doesn't have EGR
Not with out major modifications.
no. the jeep cherokee and the jeep cherokee sport have the same ingane and the same brakes they are essentially identical.
location of relay for heated o2 sensor 1999 jeep Cherokee sport
It is on the bottom of the washer bottle.