No power

I would start right at the battery and main battery cables. After that check the bulkhead connector and see if power is getting from the starter relay "stud" through the fuse link to the large red feeding through to the ammeter.

You need a factory shop manual, you can download them from MyMopar

You need a test lamp, a multimeter, and some alligator clip leads

If the battery / cables don't provide relief, turn the headlights on and "wiggle." Wiggle battery cables, the bulkhead connector, reach under the dash and wiggle parts of the harness. If you have a radio you can turn that on with the lights and even the wipers/ heater motor to watch and listen for failure.