On a 93 it would be #4
It is on the same circuit as the brake lights, but if they are not working, and the bulbs are good your switch needs cleaning or adjustment.
Attempt this first since the switch costs nearly $300 bucks.
On the passengers side of the trans just behind the bell housing there is a fan shaped switch, loosen the 12mm bolt ( smaller of the two, and rotate the switch while a friend checks the lights. this problem is usually accompanied by an occasional inability to start the vehicle, but can be cured by jiggling the shifter.
While adjusting the switch make sure that the vehicle will start in park as well, remember to block the wheels while testing the back up lights, engine off, key in run but not start, shifter in reverse, move switch until lights come on.
Once you find this spot, hold it in place and have your helper check to make sure it will start. This may take several tries to get both working correctly.
If you have no luck the switch may be dirty, this happens a lot. Hold the post to the bottom large bolt still while you loosen the nut, then remove it, then remove the 12mm adjusting bolt on top, remove the wire connector and pull the switch away, remove the bolts on the switch and separate the halves, use electrical contact cleaner and maybe some q-tips to clean all the copper connections completely apply di-electric grease and reassemble, refit to the trans and readjust so all functions work, this switch controls back up and start safety.
Caution! always hold that bottom bolt while tightening the large nut, this is connected to the gear adjuster and you could damage the internals if it isn't secured while you do it.
Drums
It should say TAIL for taillights or maybe brake lights.
It is under the back passenger rear seat.
It is a three wire switch on the driver side of the transmission.
On the back of the engine, next to the distributor.
Under the hood on the passenger side towards the back of the engine compartment.
The front and front door speakers on the 1993 Jeep Grand Cherokee are 6-3/4 inches. The rear and back door speakers are also 6-3/4 inches.
Pull straight out, not up towards you, that changes the lights from low beam to high and back, on the handle where you cut your lights on and off. The end cap is actually the switch for the fog lights.
4.0L, next to the oil filter. 5.2L, back of the engine, next to the distributor.
Type your answer here... It could be the back up light censor. Depending on where it's located, you may have to drop the tranny. that could be where the censor is located. I had the same problem in my 1998 grand Cherokee and that's where it was located. the censor is about $20.
driver side on the back of the motor where is crak sensor on 94 jeep 4.0 grand Cherokee
On my 1993, 1 is Brown/with a light green tracer, the other is black. If the bulbs are good & the sockets look O.K. The Back up lights then go to the transmission. Right side reverse switch or some say neutral safety switch.