I have a 92 and the radio does not hold memory, so every time we turn the jeep on we have to find a station every time. it does have an aftermarket alpine radio

 

Whoever wired it did not do it properly. Should be a 12v ignition and 12v "accessory" wire. The accessory wire provides 12v at all times for memory and clock function.

 

thank you, i thought it should have a memory wire, i am gonna be replacing that aged head unit this week, oh an all the dying speakers as well

 

This could also be a symptom of a poor ground or loose battery terminal. Check the wiring behind the head unit first. If that checks out then start looking under the hood.

 

Following link is description of wire function and ID for radio on 1992 XJ. Very helpful when connecting aftermarket radios. Especially when previous owner cut all the wires to stock radio connector rather than just plug in an adapter. https://www.the12volt.com/installbay...tail/1151.html