I am having a problem with my wiper motor hook up. It has a painless wiring harness and when I turn the ignition switch on, the wipers automaticlly come on and won't turn off until I turn the ignition switch off. The motor has three male ends with two close and one further off. My harness has a yellow wire that is hot when I put my light on it (when the switch is on). Also has a new wiper switch and it nor the old one will turn the wipers off or change speed. I've tried two different motors and switches-- still same results so I suspect something isn't wired right. Which prong on the switch does the hot wire hook too? Am I going in the right direction?
Advice ??
1969 RS

Wiper motor is always hot, the wiper switch provides the ground connection to the motor. Motor has one hot connection and two gorunds. The switch must contain a resistor on one of its connections to provide the slow speed wipers.

So the switch should "ground" against the dash ? Or do I need to run a ground from switch to ground source ?

also looking at the 3 wires running to the switch, which one should be ground ?

Try this wiring diagram I used to test wiper motors.

http://www.camaros.net/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=10;t=002133

Hey, thinks for the diagram. I will try it on tuesday and let you know what I find.

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Larry, Got your PM. The colors are from the 69 wiring diagram. Since the switch works via ground, you have to check the switch connection individually against the metal frame of the switch, not another connection on the switch. As long as you get continuity on each connector when switch is in that position, switch is good. Low vs high is done via a connection in the wiper motor guts, not at the switch.

Kevin, here goes---
I have two wiper motors ( both supposed to be rebuilt) and old wiper switch along with new one.
I put both wiper motors on table along with both switches. I first tested the ohm rating on each switch lead-
Off-------Low--------High
new switch 0 .6 0
Old switch 0 37.8 0
I then hooked up the leads according to diagram, first to one motor and both switches and then to the other motor and both switches using a battery charger.
Both motors would work on the "Low" position but not the "high" position with either switch.
Motor or switch problem ?

Update-- I didn't have the switch ground to motor. I did that and -Bingo-- both motors and switches work on the bench. Now to get one each to work in the car!
The motor check diagram was very helpful!

I took the wiper motor off the bench and installed it on the cowl. Ran a jumper from switch housing to motor housing for testing. Now the motor works in all positions but I have a new problem. When the arm from motor to wiper connector arms, rotates in counter clockwise position and get's to around the 5:00 position, everything binds up as if the wiper arm is a tad too long and causes the bind when going around in the arc. When I unhook the arm and reach in to turn (push the wiper mechanisem back and forth) it looks to me that the arm should be centered in the cowl hole in order to make the "arc" without binding. How ever the motor shaft actually sets to one side making the arm hook up a little toward the passenger side and not centered. I don't see any adjustments except for the rubber bushings and when I shift the motor towards the drivers side, it binds that way as well during the "arc".
???

Other people have had this problem too. I know a guy who assembled the whole thing without testing and with wipers put on, turned them on. Wipers went wrong way and gouged his new paint :)

Motor mounts only one way. With wiper tranmission off, run wiper motor and let it park normally. Then mount arm to motor with arm pointing (little fuzzy here) towards drivers side and try it again. Once you are satisfied, then you can put the blades on when it is in park, line them up parellel with windsheild trim.

by transmission, you mean the arm that mounts on wiper motor? Take that back off, turn wiper switch to on position and then off, re-mount arm and then try ? I know this sounds stupid but I have to ask.

Kerry, the rods that go to the wiper posts is called the transmission, the arm is just the arm :) Yes just take arm off, on and off the wiper (from the dash switch). Best to turn it off right after the motor starts. The motor should still move through one cycle (listen for it) then stop, that is the "park" position. Then you can mount the arm back on the motor with the arm end pointing towards the drivers side. The hole in the arm is slotted, so you only have 2 ways it could go on. one way is correct, they other is 180 degrees off. :)

Well, I unhooked the wiper and found out it would not return to the "park" position. I had another one that I just purchased from NPD -- a rebuilt one- and tried it out, it worked. Opened it up to take a look at the innerds and it looked pretty cruddy. So I am taking the first one apart to clean, check and paint and to check the park contacts. Hopefully I can get it going and have it on tomorrow. This has turned out to be a bigger project than I had hoped! But I am learning alot, thanks for all the help !!

Its the mushroom factor. A small little job mushrooms into a monster :D park mech opens/or closes a circuit when arm on wheel hits a certain point. (been a while since I took one apart), but they can be rebuilt quite easily. Clean it, lube it and make sure the contacts are good and no loose connections.

After going thru 3 wiper motors (one rebuilt) I now have a wiper motor that works correctly. I still have a problem, it seems the wiper motor arm is a tad to long ( I have it installed with the marks matching up) and will not allow the motor to turn in a full circle, seems like around the 5:00 position it starts binding on the arms and stops. The motor turns freely when it is unhooked off the arm. I can take the arm off the motor and push back and forth just fine. The arm has the letter B stamped on it. The total length is 2 13/16". The distance from the arm "pin" to the wiper motor shaft hole is 2" center to center. At the worst, I can take a 1/4" section out of the arm and weld it back. ?????

[B]finally !!
Kevin
After looking at your picture, I just had to believe my problem lay elseware. After pulling the arm off and putting it back on about 30 times, I came to the conclusion I was going to have to pull the cowl piece in order to be able to see what was going on. I pulled it and finally realized that the bolt holding the wiper mechanisim to the upper cowl shell was a tad too long-- and was being hit as the wiper rotated around!! I didn't realize this when I was pushing the arms by hand. This about kicked me in the A@#$.

During this sojurn, I found that the wiper motor worked except for the "park" position. Bench tested according to Kevin's diagram. The switch needed grounding in order for the motor to work properly so I am running a ground wire to ground to make sure. Bolt too long in wiper mechanism, thus "stopping" the complete rotation of the arms. I went ahead and took all the little ball ends apart and put never-seize on all the joints. Riveted them back together-- every thing is very smooth now.
Without everyones help, I don't think I would have fixed it! Thanks Thanks --------

:hurray: :waving: :beers: :clonk: :D