SOURCE: 1996 jeep cherokee sport.
If it's a lighted switch, you should have 3 terminal connections on it. One for the "ignition on" wire (from your fuse box). One going to the fog lights to turn them on when you flip the switch and one ground for the switch light to work. If your switch doesn't light, you should only have 2 terminal connections (no ground).
Find an "ignition on" plug on your fuse panel. It is only hot when you turn your ignition to the on position (not crank position). With your keys out, it should not have any power to it. Hook your "hot" wire from fuse panel to switch, take your keys out of the ignition first to be safe. Now hook the other wire from the switch to the "hot" on your fog lights. You will have to find a pass through rubber grommet on your firewall to go through. Use a clothes hanger to help fish it through. Now ground your fog lights to a grounding screw somewhere in the engine bay. There should be a few you can use, possibly one of the bolts that hold the front shroud on. Make sure it's a metal surface and use sandpaper to scrape off paint to get a metal to metal contact. Cover area with petrolium jelly to ward off rust. If your switch is lighted, hook to ground wire on fuse panel. Test with ignition on. If it doesn't come on, check your grounds again.
SOURCE: how to change fog light bulb on 2004 jeep grand cherokee
you have to crawl under the front of the vehicle and look at the back side of the light you will find the connector and the bulb
SOURCE: Need fog light installation instructions
Stop by your local Jeep dealership and ask teh service tech to go over the schematic and wiring diagram with you.
Most Jeep service depts. are quite helpful and won't charge you for knowledge.
Then head over to NAPA and get the parts for cheap.
If you are restoring to factory specs for show car purposes, you should get the MOPAR parts right from the dealer.
Most of the time the Jeep Wranglers have the wiring already in place, you just have to know where to look for the unused plug. At least that's how it is with my 2007 JKL Rubicon.
SOURCE: 1999 Jeep Grand Cherokee Headlights do not work
I would look at replacing the headlight switch(junkyard will save you money)!
Hope this sheds some light on it!
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