Brake lights, but no tail lights

If the tail lights were hot during the swap you may have broken the filiments. Bumping a bulb that is on or been on recently can cause the filiments to fail. Remove the bulbs hold them up to a light and see if the filimant is intact.

Also check the relay under the dash for the parking/running lights, I just fixed one in my shop 10 mins ago that needed the relay and new bulbs (bad bulb on one side caused all brake/run lights to go out if the running lights were on when applying the brakes) also check the sockets and contacts as well

So I was having the same exact problem on my 99 WJ Laredo. I looked for everything I could all damn day. I finally got to my last resort and just started pulling and checking fuses. Sure enough, the F23 Brake switch fuse was blown. I replaced it, and everything works like a charm now.

Another symptom of my issue was that one brake light was dimmer than the other, so check for that as well to double assure your situation. It's also important to remember that your sockets and bulbs must be in good shape. I hope this helps! :)

Had the same problem. I couldn't figure out why I was having the same problem on my trailer rear lights so I knew the problem wasn't solely with the wiring at my rear tail lights. Check the 15 amp fuse for Park #6 fuse. I looked at the fuse in place at least 5 times and it didn't seem blown until I removed it and it was blown. Replaced and night time running lights came on.

Also, you will need to check the contact points on the top bulb, well all three but in this instance the top bulb. The metal contacts burn hot and oxidizes causing you to lose connection. I have in the past added a strip of aluminum foil to fix. Also I used electric grease to make contact. One other thing you can do is to replace the rear assembly for $50 per assembly.

I had the same problem! Its on the driver side fuse box( which is actually called pasanger fuse box)! Its number 6 a 15 amp fuse its labeled as park lights!