Got an 97 jeep wrangler the check gauge light well come on then the charging gauge quits, if u start it back up willl work for a while then the same thing

It still sounds like an alternator issue when the vehicle is running you should be showing 14.4 volts going into the battery try a load on the system while checking this means turn everything on the blower the lights 4-ways the A/C everything then see if the charging system can keep up

Do the other gauges quit working also. If so you have an electrical connection problem at the back of the instrument cluster. Remove the cluster, unplug the electrical connectors and clean both sides with "electronics cleaner". Insert plugs and reinstall cluster. This is a common problem. Be sure to look for burnt contacts.

use a digital voltage meter on the battery to verify the 'spikes', Jeep Wrangler gauges are notorious for being erratic (I have a 98 TJ, how's your gas gauge working?)-

the printed circuit board gets weird due to water leaks that find their way to the back of the pod from the top of the roof seal, so it is not unusual for gauges to act strangly.

If that is not the case, it is time for a new alternator.

With the jeep running put a volt meter on the battery and it should be reading above 13 volts if not replace the altinator it isn't charging.You can check the fuse for the altinator first if not charging but most likely the altinator is bad.

bad battery or bad,corroded terminals

check the wire near Diesel pump solnid, put a wire from +ve teminal of bettery check the solnid is working or not?

I am having the same issue with my 98. Did you figure it out?

IF YOU REMOVE INSTRUMENT CLUSTER AND UNPLUG IT,PLUG IT BACK IN AND UNPLUG IT AGAIN..DO THIS A FEW TIMES..IT SHOULD CLEAN OFF SLIGHT OXIDATION ON CONNECTOR TERMINALS..HAVE SEEN THIS BEFORE..I ALSO THINK REPAIR CONNECTORS AVAILABLE FROM DEALER

ck the engine to body ground.located back side of engine and srew to firewall.

The diode in the altenator is starting to go out.
I would check the belt to make sure correct tension and check the battery . The battery could be starting to go out , The battery might not be able to hold a charge anymore .