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I am going to move this to the 1st Gen Section. Your truck is considered a 1st Gen and the guys in that section should be able to help out the best! Good luck with finding your answer and again WELCOME!
here's a trick i learned a few years ago. pull the connector off the wiper motor, hook up direct power from the batt to the motor (you have the wiring diagram), they seize up and 14 volts from the batt will loosen it. did it to the wiper motor and the wiper/wash motor on the tank and 3 years later they still work good.
p.s. if you get smoke disconnect right away, the motor is beyond repair.