I have a 97 jeep wrangler sport 4.0. I had 2 change my heater core so in order 2 do that, I had 2 take everything out. After I changed my heater core I had everything hooked up (so I think) up 2 the instrument panel, wich was only plugged in and not screwed on, I was curios 2 see if my heater worked (along with everything else). When I had turned it on the brake light started flashing and beeping like the head lights were on and the door was open, so i pushed on the instrument panel and the beeping stoped and the brake light stayed on. Also all the gages on the instrument panel dont work. What could be the the way 2 fix this?

SOURCE: cig lighter

under the dash on the drivers side ... i believe the radio uses the same fuse as the lighter.

Robert

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SOURCE: the gage cluster

Had the same problem on my wife's 1999 Cherokee.  I had to take the entire left side of the dash off to get the instrument cluster out.  You need to unplug it and clean the plug and the instrument cluster itself off and then put everything back together.  Worked for me and haven't had a problems since.  One note: the headlight switch has to be taken off and it's kinda hard.  You have to get up underneath it and  there is a clip that has to be pinched in order for you to pull the switch off.  Hope this helps because I know what a pain it is!

SOURCE: Winshield Wipers stopped working on a 2001 Jeep Wrangler.

TAKE IT BACK THEY HAVE LEFT A LINK OR POWER FEED LOOSE

SOURCE: Brake lights on my wrangler won't work

also the multifunction switch in the steering column cancels out the brake lights when the turn signals are on.. this swtch assembly has brake signal that goes to it then is split to the rear lights of the jeep. this might be your issue