1993 ranger supercab charging guage remains high all the time. When not started for a few days the battery will die.

Seems that you have a power drain. If you installed any electronics check to see if the wire has an open section that is bleeding the system.
Check to make sure that when the glove box closes the light in side goes off. A sprung glove door will keep the light on and will drain a battery in about 3 days.
If you put a trailer hitch on the truck make sure that the grounding is done correctly. Lighting harness to trailer, trailer to truck. A poor ground will cause the electrical leak and drain the battery if the trailer in attached for a few day, less than 3.