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Old 03-07-2014, 12:39 PM
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68 chevelle wiper motor help

I need to find a way to restore the wiper motor function on my car. The wiring harness has been removed as well as the motor and the switch. A new custom dash has been installed and I want to simply run a toggle switch to operate the wipers on one speed when needed. The washer pump is no problem as I can add a new style electric motor with a seperate switch. I have the hide away wipers. I bought a wiper motor off ebay that stated it was bench tested and works. Ofcourse when I got it I cant get it to turn while running it off a power supply. I actuall bypassed all the spade connectors and went right to the motor wires themselves and it still does not turn. I believe the motor is bad. I will get a new wiper motor but has anyone found a way to allow the motor to work off a simple switch. I realize its a ground switch circuit. Remember there is no factory wiring so telling me the color scheme wont help. I would need to know what terminals are +12v and which are ground.

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Old 03-07-2014, 04:39 PM
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I have little to no experience with wiper motors..... did you try grounding the motor casing to the neg post on the battery and one of those wires to the hot?
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Old 03-07-2014, 05:20 PM
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Wipers are suppose to have 12 v + to the yellow wire with the key on.
The speeds are controlled by the switch, completing a path to ground
The terminal with the light blue is for low speed, the terminal with the regualer blue is for high speed.
There is a ground strap on the motor that goes to the mounting bolt as well, it needs to be there.
I found this simple diagram which should help.
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Old 03-07-2014, 05:58 PM
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Thanks for the reply, however since I have no original wiring there is no color codes. I realize the yellow wire is to have 12volts but which terminal is the yellow wire attached to? The center, left or right terminal? Your drawing shows the yellow on the left terminal I was under the impression it should be in the center? I think once I get a working motor I can figure it out by process of elimination but it would be nice to know in advance.
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Old 03-07-2014, 06:01 PM
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You cant be sure the motor you have is not working unless you connect it correctly.
The wiring layout on the diagram should be the same position as your motor as long as you orient the motor to the diagram.
Try to hook t up by the diagram first, just to see if you can get any action
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Old 03-07-2014, 06:04 PM
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Your right I will try to get it to work according to the diagram. Its obviously not in the car so I will try it on the bench. It would make me feel alot better if I can get it to run on the bench.
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Old 03-07-2014, 06:10 PM
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Much easier to bench test it.Then you know it works. AND ,if you install it and it wont run.....then you know the cars wiring is the problem.
Git er done.
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Old 03-10-2014, 05:17 PM
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Ok fellas.
this thing is a vaccum nightmare and a plumbers maze.

Lines and hoses everywhere. I'm not really into ac so I'm thinking of removing it along with anything else un needed. I'm just kinda at a loss of were to start. Ive had a lot of cars but none none with the amount of twists n turns like this thing.

Weres a good starting point to see if its the fuelnpump or the filters or the lines? Wow...I'm baffled. Hg
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Old 03-10-2014, 05:24 PM
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Don't take this the wrong way cause I'm not trying to be a smart butt....... get a build book for your car, I have one for my 67 Camaro that I have consulted often when restoring her, invaluable! Several times I found issues and thought "why did they do that" in order to get the proper replacement parts the assembly manual came in very handy, teaching me how the parts were supposed to go instead of the maze that was there. Got mine off ebay for a few bucks
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