I have a 91 pick up and the windshield wipers aren't working. If I run a hot straight to the yellow wire or blue/black wire the motor will run the wipers. I checked the wiring with a meter and when the wiper motor is hooked up the wire shows zero volts (still the yellow wire which is 'high' I believe). With the motor unhooked it shows 12v. I also found the wire coming straight from the switch and tried jumping it to the motor but I ran into the same voltage dropping to zero problem when the load was applied. Thanks for anyone that can help!

 

BTT, can anybody help? It sucks having everything else work on the truck and not this.