1970 Wiper Motor Issue - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 2 (permalink) Old Aug 5th, 18, 10:46 PM Thread Starter
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1970 Wiper Motor Issue

I put a new wiper motor on my '70 Elky last year, and had everything working great. I took it off to paint eh firewall, and now I can't get it to work. Across the bottom are 3 spades, looks like the left one (looking at the firewall, and closest to the engine) is a black wire, the center one is black with a yellow stripe, and the outer one is light blue. The one with the yellow stripe also goes to the outermost spade on the washer motor, and the inner spade on the washer has a dark blue wire on it. I've swapped the wire around on the bottom and got the motor to run all the time, and when I move the switch, it shocks me. That tells me that I have a bad or missing ground somewhere. Any ideas on how to get this working? Is the black wire a ground, and if so, could I route a redundant ground from it? I hate to start hacking on the wires, since it worked before. I also had the dash out, and when I reinstalled it, I made sure all the grounds were attached, and even double grounded the headlamp switch, which also grounds he wiper switch. Everything else on the dash works fine.

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1970 El Camino Custom, 350/300, needs paint, rust free Arizona car
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post #2 of 2 (permalink) Old Aug 5th, 18, 11:04 PM
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Re: 1970 Wiper Motor Issue

Probably the ground. There is a ground strap on the wiper motor on top of that strap is a wire ground wire for the washer pump. It has a rubber grommet that the mounting screws go through. That rubber grommet could mislead you to think it is not the actual ground strap. Painting your firewall leads me to think it's a ground issue.

The center lead is the power in lead. You can check it with a test light. The actual dash switch supplies the negative to the various spades to control the wiper motor.

First thing in this video shows the ground strap.

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