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Questions and Answers

Jimmy Windshield Wipers

Q. Vincent, please help. I have a 1992 GMC Jimmy, 4.3 liter vortec engine, automatic, fuel injected with about 100,000 miles.

My wiper motor went out. I went and got a new/used wiper motor. The first time I replaced it, I thought I would test it before securing it to the frame.

I hooked up the power to the new motor and turned on the wiper system. Initially it did not work. After adjusting the wiper knob inside the truck from delay, to slow, to fast and over all again the wipers started working. The problem was that they only work on the fast setting, and the wiper fluid motor started running and would not shut off. Even with the wiper motor in an off position and the wipers not moving, the fluid motor runs. I had to disconnect the power to the fluid motor.

Thinking that I possibly got a wiper motor that did not have delay, I found another wiper motor. When I picked it up there was a guy that said to make sure to bolt it in before trying the wipers, as the bolt is used as the ground. The new wiper motor worked the same way, only on high, and the fluid motor runs constantly. The fluid motor is still unplugged, as of now.

Now I think I shorted something out, as the first motor was not bolted in, therefore not grounded. I do not know where to begin to look now. Any suggestions would be great. I just want my wipers to work properly again, and to be able to clean my wind shield with fluid.

Thanks.

A. The only two things that will cause the wiper motor to work on high speed only is a bad wiper motor, a bad wiper switch or the wiring between the switch and the motor is open. Okay, three things, I lied.

Install the wiper motor in the vehicle and plug the connector in. With the switch on low, you should have power to the gray wire at the motor. If you don't, then the switch is bad or the wiring in between. If you check for power at the switch connector and there is none, then it is definitely the switch. If you do, it's in the wiring.

With the switch on high, you should have power to the purple wire at the motor. If you don't, then the switch is bad or the wiring in between. If you check for power at the switch connector and there is none, then it is definitely the switch. If you do, it's in the wiring.

Since the washer pump does not shut off, I would suspect the wiper switch is the most likely culprit.

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