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Old 11-04-2017, 10:32 PM   #26
SBPage1
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Re: O.K.? What's the secret about wiper motors?

I have a 1988 C3500 w/7.4. Been having the same issues with wipers working sporadically. Went to local parts store and bought some Dielectric Grease and some Contact cleaner. Took module out, cleaned the contacts on both ends of module, put dielectric grease on contacts at both ends, as well as running a piece of sandpaper across the contacts that look like points. Reinstalled module and it works like a champ!

Antiquated system for sure. Give the cleaner and gel a try!
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Old 11-05-2017, 12:10 PM   #27
mountie
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Re: O.K.? What's the secret about wiper motors?

Good job,,,,, I did the same "band-aid fix" ( no offense).... It will fail again.

Do what I did.... get a '95 wiper motor. Bolts up same as the old one.
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Old 11-05-2017, 01:31 PM   #28
abig84
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Re: O.K.? What's the secret about wiper motors?

Quote:
Originally Posted by mountie View Post
The symptoms start slowly. As you turn on your wiper, it could do a number of things:
A split second pause to react.
Will turn on but will stop/start once in a while.
It only works on fast mode (most often does this).
Turn off ..it won't stop at bottom... you have to "time" the off so it stops at the bottom.
Won't turn on at all....... THEN it turns on whenever it wants - off whenever it wants.
(You start to worry)
Bump the wiper motor with screwdriver handle to turn on ( fast mode only)

Wished you looked for the "&%$@*&" part sooner.
my 1990 had the same issue. so i figured it was something with the circuit board because if i pulled on the plastic parts it would usually start working fine. so about 5-6 years ago i shoved a bolt between the plastic part of the motor and the firewall... worked fine ever since

i do have a back up one though that came out of a 1991 (hopefully its the same) if it ever goes out but so far that temp fix has held out
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Old 11-05-2017, 07:41 PM   #29
mountie
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Re: O.K.? What's the secret about wiper motors?

Yea... What I enjoy about my older truck is it is cheaper & kinda fun working on it. I also like to improve/upgrade it as stock as possible.

If I had to upgrade my wiper motor again, it would take 45 minutes or so.

also put a new switch in the steering coloum. The turn signal lever is just the "knob".... the actual switch is inside. That will wear out.
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Old 11-06-2017, 01:34 PM   #30
SBPage1
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Re: O.K.? What's the secret about wiper motors?

All great inputs and I will remember these as I deal with this module. Temp fix for now and when I get time I'll look into a new wiper motor with different module. The big block in this truck generates a lot of heat and I can see all my working drying up soon.

Thanks for the help
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