wiper issue

[Erik Anderson]

75 GMC K25 wipers not working. I have 12 volts at the wiper motor which i know i should have but i get no voltage on the other pins with the switch. Im just curious if anyone else has had this issue before i try to replace the switch.

 

[84-C20]

I'm not sure on the specifics of how the switch powers the motor, but please make sure you have a good ground to your motor. Even if you don't think this is the issue it only takes a second to check and could save you a headache either now or later. The motor is grounded with a little metal tab to one of the mounting bolts. Take an extra length of wire and run it from the negative terminal to the housing on the motor. Whenever I'm testing motors that's the first thing I do and I'll leave the wire hooked up while I diagnose the issue. To me it's just one thing to eliminate quickly.