Wiper motor will not turn off

[kevken1959]

I disassembled a wiper motor to detail it and replace the wiring harness that was damaged by rodents. When I put it back together, it works great in both speeds but keeps running when the switch is turned off. I then replaced all the components again from different motors I have and it still won't turn off. I did regrease the gears. Maybe I got grease somewhere where I wasn't supposed to? I checked the ground strap and sanded all the connections to the firewall, so that's not the problem. It's not the switch. I threw on an untouched wiper motor and it works fine. Any ideas?

 

[Bentworker]

You must have something gummed up with the wiper parking switch. You need to use really thin grease like NLGI 1.5 or 1. Pull it back apart and look closely at the parking mech.

Look over this old thread

Windshield wiper park when switch turned to off?

The 71 is slowly going back together. Today I finished up installing the wiper motor and linkage. Gave it a test run and it seems like the wipers don’t park on their own. You have to time turning off the switch at just the right moment to park the wipers. If so any guesses on what is wrong...

7173mustangs.com

 

[mrgmhale]

I am inclined to agree with BentWorker on this one. Attached is 1973 Shop Manual Section 35-60 for Windshield Wipers. They provide several decent illustrations you can refer to.

 

[kevken1959]

I disassembled a wiper motor to detail it and replace the wiring harness that was damaged by rodents. When I put it back together, it works great in both speeds but keeps running when the switch is turned off. I then replaced all the components again from different motors I have and it still won't turn off. I did regrease the gears. Maybe I got grease somewhere where I wasn't supposed to? I checked the ground strap and sanded all the connections to the firewall, so that's not the problem. It's not the switch. I threw on an untouched wiper motor and it works fine. Any ideas?

Ooops! That's exactly where I piled on the grease, lol! I'll clean it and try again. Thanks for the replies!

Kevin.

 

[piper62j]

The motor actually reverses itself when shut off so the wiper blades will park. Lood for a loose or broken contact where the motor contacts are near the gear cover.. Also, where the chewed wires were, double check continuity at any splices.

 

[kevken1959]

The motor actually reverses itself when shut off so the wiper blades will park. Lood for a loose or broken contact where the motor contacts are near the gear cover.. Also, where the chewed wires were, double check continuity at any splices.

Thanks piper62j!

 

[mrgmhale]

I am inclined to agree with BentWorker on this one. Attached is 1973 Shop Manual Section 35-60 for Windshield Wipers. They provide several decent illustrations you can refer to.

Ooops, I could and should have provided a schematic so you can double check the wiring and voltages. Here you go, from a 73 schematic. If this is not like what you have let me know trhe model year and I will see if there is a difference in prior years. I am pretty sure 71-73 were the same with wiper motor schematics, although at the fuse block there were likely some differences...

 

[70cobrascj]

Is it possible to bench test the wiper motor?
I took mine apart to clean it all out and repair it. It was in the parked position when I took it apart. But did not go back together in the parked position.
Thanks

 

[Precision Transmission]

Ooops! That's exactly where I piled on the grease, lol! I'll clean it and try again. Thanks for the replies!

Kevin.

Did you check the "park" switch in the motor assy.?

 

[Sheriff41]

I disassembled a wiper motor to detail it and replace the wiring harness that was damaged by rodents. When I put it back together, it works great in both speeds but keeps running when the switch is turned off. I then replaced all the components again from different motors I have and it still won't turn off. I did regrease the gears. Maybe I got grease somewhere where I wasn't supposed to? I checked the ground strap and sanded all the connections to the firewall, so that's not the problem. It's not the switch. I threw on an untouched wiper motor and it works fine. Any ideas?

Did you find a solution for this?

 

[kevken1959]

Did you find a solution for this?

Hi, Sheriff. I cleaned everything up and put it back together but I haven't had a chance to test it.