If your 1997 - 2000 Jeep came with the factory fog lights, you've probably noticed you can't run them and your high beams at the same time. There is a relay behind the glove box that controls this behavior. Remove the glove box and look to the right of the fuse box. There are 2 relays there on a connected. You can pull the relay straight up - most likely the whole connected will come off its holder. Pull the relay nearest the passenger door (assuming you have doors!) and bend pin 2 over as far as you can so the relay can be reinstalled. If the connector came off, like mine did, you can get the mounting clips to come off the bracket they are on by squeezing on the back of them and pulling them through. Then slide them back onto the connector and push the connector back into place.