intermittent wiper questions

[78C10BigTen]

It's supposed to be spring loaded, so when you bump it left, it returns to off on its own.

Ah that makes sence i never thought of that, still kinda learnin as this is my first square. Im gunna replace the switch in the near future and then attempt to change the washer pump

 

[87scotty]

On the wiper deal I put a new switch on my 87 all works good but of I shut em off they just stop never go back down I have to bump the spray to get them down not a big deal but not right non the less

 

[78C10BigTen]

On the wiper deal I put a new switch on my 87 all works good but of I shut em off they just stop never go back down I have to bump the spray to get them down not a big deal but not right non the less

I do partially chock them little defects up to a 40 year old electrical system. Im just glad they work lol

 

[bucket]

On the wiper deal I put a new switch on my 87 all works good but of I shut em off they just stop never go back down I have to bump the spray to get them down not a big deal but not right non the less

That's likely a faulty wiper motor. I hate it when they do that.

 

[gmachinz]

I usually stock those GM modules-on used ones I typically replace the electrolytic capacitors with new Panasonic ones of the same value-those are the most common failure part on those old solder PC boards.

 

[gmachinz]

The range of delay is 0-37 seconds on the ones I've refurbished and bench tested. They were offered on 78-83 trucks and were a much improved version of the 1977 setup which was the first year for delay wipers-tho the '77 version is not very reliable. I have a handful of used ones and 1 NOS module left on hand. Nobody reproduces them and none are on the GM locator anymore either so basically, they are gone unless you find a used one.

 

[highdesertrange]

so I have the same system on my 78 sometimes the delay works sometimes it doesn't. when it doesn't work the wipers just come on low then all of a sudden they will go into delay then back to low. any ideas? highdesertranger

 

[gmachinz]

Most likely a faulty switch-I'm willing to bet the potentiometer knob is bad. These things are very touchy-the only other problem that can cause this is a leaking electrolytic capacitor on the circuit board. Those things get weird as they age with use-that's why I replace them.

 

[highdesertrange]

yeah I replaced the switch and the control module about ten years ago because of the same issue it never has worked right. highdesertranger

 

[gmachinz]

I just pulled down one of my few remaining NOS pulse delay modules and its a much later design-not like the oe GM one but functions the same-somebody must have re-popped them for GM for awhile it seems back in the day.

 

[MikeB]

Have you tried relocating the wiper arms on the splined shafts, or are they keyed?