1960 Chrysler Wiper Motors
by John Grady

September, 2020

I had occasion past few days to work on three F windshield wiper setups. These came with the “do it yourself F kit“ I bought in San Diego.

I had sent some pictures of work on a fourth one earlier this year, mentioning the need to be sure to ground both the motor unit and the switch housing or you will damage the motor on the bench. That was a 57 but these seem to be the same functionally. The switch body completes the field circuit to ground.

This is how it reverses to park -- it swaps the field wires. Yellow and red are field, black is the armature and green is armature via park switch. The yellow and red have to be right way on the switch - see picture. That is correct placement. Black is “run“ armature, green is park and white is the switch ground.

All 4 of these wiper motors had sticky park cam switch levers in the gear case cover due to old grease. A stuck switch means no park. The cam must readily self center with the light coil spring on it. In my case the plastic park switches were always good, but it was where the cam goes through cover plate to move switch that caused the sticking to one side. After total disassembly of all that switch stuff twice on the first two, I realized that 75W oil on both parts of the nylon cam the on underside of removed cover plus working back and forth frees it right up! Easy!

But on all 4 motors the wires coming out have fabric sleeves that dry up and crumble off the winding wires at the motor hole. That is a short circuit, either now or in the future. So I disassembled the motor and replaced the wire from the brush with new plastic coated wire, soldered it on to the brush tab and covered the others in small shrink tube to about 1/4” into the motor. To keep the wire identity I used colored shrink tubes. By the 4th one it one took only an hour to do.

I left the wiper arms on because it is a bear to get that screw out. Generally it is corroded solid. Plus, it is complicated to get the arms reassembled correctly. I did oil the joints.

Two wipers had a smashed park switch housing due to careless handling. The switch sticks out and is easy to break. I fixed them with epoxy but it is frustrating to have to make that repair – better to protect it in storage. I used 3/4 4/40 screws to reassemble, the switch mount plate slides side to side to get the rivets out.

But if not broken, the switch is rugged and 99% of the time it is OK and the problem is the cam sticking.

On reassembly be sure the cam pin drive is hanging down into the 180 degree open part of the U on the big gear. You can position it about in middle of that 180.

Despite what FSM says it seems to be OK to open the motor plate anywhere in the cycle, but to be safe and careful. If you are working on the motor in the car, stop it mid stroke by turning off the key not by the park function. Not sure why-but what they say. All 4 of these were stopped in park and re-synced themselves OK.