I would really like to install this on the vette, but I was wondering if anyone has used this particular kind:
http://www.jcwhitney.com/autoparts/P...X/appId-503346

it says:
"Designed for all 12-volt systems except those with 3-speed wipers or AMC, Chrysler & Ford vehicles with concealed wipers. "

So will it work on Chevys with concealed wipers?

If anyone has used it, are there any drawbacks (other than the fact that it has to be turned on seperately and is really big and ugly)?

Thanks in advance!
Scott

 

anything will work if you have enough time and money to throw at it.

I'm not so sure it will be the exact super fit that you are looking for.

 

Well, I'd rather not throw a lot of money or time at it.

I know it won't fit in the original switch location, in fact looking at it I'm not sure it is supposed to replace the switch, but work in conjuction with it. I would think it would have to be located under the dash or somewhere.

What I was wondering was if it would work, unaltered, on a vette that has a functioning wiper door.

Has anyone here used one of these?

Scott

 

It won't work, unless you use the door over-ride pull switch under the dash. The stock wiper switch actually actives a solenoid that ports vacuum to the door open side of the relay valve. When the door opens it contacts a switch that completes the wiper circuit. The delay set-up would put power to the wiper but not the solenoid behind the tach. By opening the door with the over-ride and THEN use the delay it will work. If you forget to open the door the wipers will try to operate and hit the door. This may cause a fuse to blow or burn up the motor. Shutting them off will not help because once actuated, wiper must go one full sweep and the park.

 

LarryB, no insult really but you gotta be an ET or some such to figger this sort of stuff out correctly, I have some decades experience with that crap, and it took me about 4 attempts to get my '72 wiper door and intermittant wipers to work right....

yes the size of the controll diameter is important, the only one I could find these daze was a 10k audio taper pot with switch on it, in order to fit into the remade/redrilled slot of the original switch position, washer buttons and speed controller are drilled on either side of the centrally located damn 10k pot/sw assy from Radio Shack....

NOW the entire functionality of the system need be altered in order to do this reasonable....

I relocated the wiper door controll vac solenoid from the tach to under the hood, made service easier...duh....

so that solenoid is activated by the on off switch on the controll pot....fine, door opens, activates the motor red hot wire....
now the timer I custom built to fit in that location of the original switch area, has a relay and a circuit board...all handwired...and a timer chip known as a 555 in the trade....
and a buffer transistor to take the relay coil currents....
the 555 has a Q and Q/bar output, that means you can use it either way....
problems are that the use of only a 10k pot means you need a what,?? I ferget...100 or 1000 mfd capacitor as primary timing cap....that means the discharge resistor needs be very small, in order to get the sequence right to the wiper blades...too small a start duration pulse will not allow them to actuate, they start, but the sustain function of the motor assy will not allow them to retain operation, they return to rest....

beleive me when I say, all this worked fine when originally designed, but when driving, and running a/c or other accy's and then the wipers, I found it more perplexing than I thought....

In the past I have used the Whitney timer on other cars and found it fine....I suspect that electronically it's your answer, just that mechanically, it may not be the unit for you....

GENE

 

That's a good point, but I'm curious. This delay switch (as far as i can tell from looking at the pic) doesn't seem to control the wiper on/off or speed functions. It would appear that you neeed to turn the wipers on using the factory switch, at which point the solenoid would allow the wiper door to open. At that point you set the aftermarket delay switch for a 2 to 20 second delay.
I was wondering if the "delay" would in effect power down the entire circuit (the solenoid that controls the door as well as the wipers themselves) or if it would just stop the motor.
I'm not familiar with how the stock wiper switch is wired; would it be possible to just have the delay affect the wiper motor circuit, while leaving the door solenoid energized?
If so, this seems as though it might work. My main concern is that the wiper door would have to open and close every time the delay was used.

 

Gene... I wouldn't think of taking offense. I was merely trying to give a quick overview and way to make the stock delay set-up work. Sometimes a simple approach is the easiest. I understand the advantages of the "engineering" aspects of a re-designed system. There are many ways to do things...RAIN -X would be an option too.

 

I had one of these things in my '79 Bonneville. As I recall, it splices to a couple of the wiper wires and it does function as an on-off switch for the wipers. When you want delay, you probably don't want the wipers on high speed, so it gets tapped into the low speed wires.

The way it works is it literally turns the wipers on and off. In my Bonne with the recessed-park wipers (like the C3 has) it turns them on, they wipe once, then they recess and park, then *click* thay come on, the wipers come up, then wipe, then recess....etc....

So with a C3, it'd be exactly as if you reached over and threw the switch every 5, 10, 20 seconds or whatever. The wipers would open and close the door with every stroke unless you used the override switch under the dash.

Personally, I'd go with Rain-X

 

Well, you see in the many itterations over the years this system has had, I found the final and best solution is doing the interrupt to the yellow wire, using the yellow feed to of course activate the door solenoid, but putting the relay in the yellow feed wire to the wiper motor, that eliminated any problems related to accessories, pulse loadings, and other symptoms of EFI/EMI on the 555 timer....

the entire circuit could have been simpler yet, IF I could have found a 1 meg pot instead of 10k, as the stability would be much better.....temps of the ducts make a differance too, nothing that can't be dealt with by adjusting the pot, but having that large electrolytic timer cap means a lot of drift....

need an easy source for a one meg linear taper 1/2 inch diameter, 1/4 inch shaft pot with switch on it....hard to find these daze....real hard...

GENE