The GEM module is a possibility. I got a reply from my cousin. Rather than retype eveything, here's a copy / paste version of his reply:
Using manual for '97. PW---does it have p seat, p lock? If so, do they work? If so, fuse 20A #10 (under hood) ok. Power goes to relay. Relay is activated by ignition switch. From there the power goes to the switches, one touch down relay module and GEM. Interior lights--? Are we talking dash, dome, glove box, heater control, etc? #8--20A fuse--engine compartment feeds battery saver relay--that goes to #27 a 10A mini I/P fuse panel which goes to all of the interior lights. The GEM controls the battery saver relay. 4 X 4 system seems more involved--is it in 2wd or 4wd--does the transmission shift properly, including O/D? Items included in the system are--GEM. Battery saver relay, I/P fuse panel, fuse box under hood, 4wd mode switch, electric shift control module, electric shift relay, etc. The common elements to all 3 (if this is 1 problem) would seem to be 12V, ground--, GEM, battery saver module and relay, other? If this is one problem, I would start troubleshooting the lights, that would seem to be the easiest. Other than the modules, visual troubleshooting--looking for a corroded ground, wire that looks pinched, rubbed, etc. Make sure you check all of the lights--flashers, cargo, etc for more hints. Was this intermittent, or start with no warning.
Thursday, January 17th, 2019 AT 6:03 PM