I drive a 02 GK Laredo. Just got the jeep back from the shop, had to order a new right tail light. 2 days later I found out that now both my brake lights were out. After troubleshooting for a while I found that the fuse for it was blown so I put a new one in. I hit the brakes and for a second the lights came on then died again, fuse blown again. I took it back to the mechanic but surprisingly theyre saying its not their fault seeing as its electrical problem, I told em bs it didnt happen until after you all touched it!
Anyone have suggestions to what may be causing it? Both tail lights work fine with the exception of the brakes.

 

You have a short to ground someplace.