Appears to be no supply to light switch, fuses ok, if separate supply induced to fuse block they work as norm,does supply to switch come from head light supply system(40amp) fuse in engine compartment! all other lights work.
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If it happened the way you described it. I don't see how it could possibly have damaged anything. I guess what you are saying is that the left tail lights are not working? ("4 way exterior dim lights"???) Touching the tail light wire to the turn signal wire will only cause your turn signals to light up. (I am assuming that the tail light switch was on at the time)
I think it is more likely that the brown wire touched ground. This would make a bright flash, blow a fuse and cause the symptom you are describing...I think you need to check the fuse again.
There are separate fuses for the left and right sides. The left side tail lamp fuse is fuse #7 in the junction block it is a 10 Amp fuse. The junction block is located on the right cowl side inner panel - We are NOT talking about the Power Distribution Center under the hood.
All of the above is also assuming that we are talking about a plain Cherokee, Cherokee SE, Cherokee classic or Cherokee Limited.
If we are talking about any of the Grand Cherokees, you may have a fried lamp outage module.
You have all the fuse locations. I have seen some that after radio was put in did that. usually it turns out that re-grounding the dash or using different power supplies for the radio has corrected it. otherwise, I'd check the light switch and make sure it's OK.
with a test light or voltage meter you would check fuses - if good check power at switch and thru switch when turned on - then relay for headlights - then power at lights - you can use battery post as ground first - then use body metal as ground - this will tell you if the problem is on the positive side or negative/ground side
This means you have a short. I am assuming you are talking about the fog light fuse. Does this fuse blow whether the fog lights are off? or just when turned on?
If the fuse blows when the switch is off the switch is bad too. If the fuses only blows when the switch is turned on you have a short in the wiring or bulb.
I don't know if you have test equipment so first I would say to remove both driving bulbs from their sockets and see if there is corrosion. Fix that problem if there is corrosion.
Then install a fuse without the bulbs and see if the fuse blows. If you have a test light you can bridge the fuse panel without putting a fuse in. If there is a connection you have a hot wire grounding. If there is no problem install one light, fuse or bridge the fuse holder and see if 1 light works. Try each side. This way you can isolate the problem. Then visibly inspect wiring.