63 wiper motor question

[Thomas R.]

I need some advice with a wiper motor problem?

I have read most of the technical discussions on the wiper motor testing, and
everything in the shop manual.

I started with the usual problem of the wipers not parking. The car sat during a restoration and when I restarted the car the wipers would not work at all. I cleaned out all of the old grease and freed everything up and the motor bench tests fine with one exception.

When parking, the motor will cycle 2 or three times on the stop (park) actuation. The motor does not make a complete rotation it just takes a few clicks of the relay switch before coming to rest.

I disassembled the relay and found the switch to be a 2 contact switch. The solenoid (electrical) actuation with ground pulls the relay up and makes the internal green wire to the internal yellow wire powering up the motor. The motor runs and will continue until the ground is removed from pin 1 (or 1 & 3). When the ground is removed the solenoid drops and puts the mechanical stop in the path of the actuator. The second switch appears to be a holding contact, which will which keep the motor running until the mechanical stop lifts the second switch dropping out power to the motor.

If I stop the motor in the middle of a rotation by disconnecting power I can see the mechanical arm that lifts the stop switch. (It's very small).

At this point I am not sure if I need to:

1. Bend the stop up to lift the switch higher to break the circuit. It's looks fragile and I don't want to break it.

2. Put it back in the car and see if the load on the motor allows it to park ok.
Everything is cleaned and greased so it's very loose and I am not sure if it's
coasting enough to begin another stop cycle.

3. Or is this normal?

I think I have the circuit correct but if I have it wrong could someone let me know.

I hate to put it back in the car to try it as it's a pain to remove, any advice would be appreciated

Thanks

[Joe R.]

Re: 63 wiper motor question

OK, here's what's happening. You are grounding the lug closest to you on the bench and the motor is running in high speed and when trying to park it over-runs the stop.
When parking on the car the switch moves the motor to low speed so it won't over-run the stop.
Try parking the motor by grounding the lug in the back and the one in the front (center is +12 all the time) and the motor will be in low speed. Remove the ground on the front closest to you and the motor will park in slow speed and park every time.
Well, it should anyway.

JR

[Thomas R.]

Re: 63 wiper motor question

Thanks Joe

I tried it on low speed and it isn't as bad. It will park on the first try about 50% of the time. I'm going to take a chance and put it back in the car. I'm hoping that the load with the wiper hardware connected will
correct it. I will let you know.

Thanks for your hep

Tom

[Thomas R.]

Re: 63 wiper motor question

I put the wiper motor in today and the wipers park fine with the linkage
connected. Looks like the load on the motor slows it enough that it
dosn't over run the switch

Thanks for the reply

Tom