Alright, I work on cars for a living but electrical is not a strong suit of mine, especially in this sort or situation. Long story short my 99 XJ with the brake lights on and the left blinker on, the right reverse light flashes as we but dim. Same for the right blinker, however then the left reverse bulb flashes as well. The brakes have to be applied for this to happen & sometimes it has to be moving? Only "modification" to the tail lights are LED reverse bulbs, and have had no issues for 6 months. I've checked the wiring behind the tail lights and all is good, getting the correct voltage. I'm at a loss here.

 

See my sig, #1.

 

See Marks sig, #1.
__________________
When electrical things get weird, check your grounds.

Once I clamped one end of an old vacuum cord to bat negative and went back and poked it on bulb sockets. Easy way to find a bad ground if you have the wire.
It's trying to ground back through other bulbs.

 

That's what I was thinking, I guess I just can't seem to find a wiring diagram with any ground locations.

 

Search on username CCKen. He has posted photos here many times. He's got all the photos and diagrams of every electrical component from every year of every Cherokee made, I think!

 

Both my 90's, I leave the 3/8 bolt under the tail lens out. Makes it very easy to remove the lens and change bulbs. In the time it's taken you to look for a diagram I likely would have found the bad ground. Btw one of my 90's had a fubar ground in the taillight. I forget exactly, but remember thinking that it was a funky design.

 

I've already pulled the tail lights out and the wiring is all good behind the tail lights.

 

I'd try grounding the metal of the bulb socket, or checking resistance to ground with a meter. Might at least let you know if that's your issue or not. Good luck!

 

Note from DJ
https://www.cherokeeforum.com/f2/nee...oblems-206271/
See Post #5 by CCKen

 

There ya go! DJ got it!