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I have converted a dumptruck and unfortunately with the 92 cab I didn't grab the engine comp harness and ended up with a 95 harness. Everything works great except the wipers. I had to switch out the motors cause the 92 has 1 plug and the 95 has 2. I have clicking at the governer under the dash but nothing at the wiper motor. When I checked the pin out they appeared to be the same so I was wondering what I need to do to get this working without swapping out the harness and motor.
Once again if it wasn't for this site I would have struggled do this project.
I take it you are talking about "F" series trucks here.
The wiring diagrams are the same for 1992 & 1995 except that the 1992 has two plugs at the motor and the 1995 has one.
If you wired it like the diagrams then you may have a bad motor or governor.