looking for wiring info for '76' gm wipers

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Old 10-05-09, 07:44 PM
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Question looking for wiring info for '76' gm wipers

i am a ford guy,but all my 'inlaws',think 'i' have unlimited knowledgeof every thing.
as of now, i am trying to help one with a '76' corvett.
windshield wipers-inopp.
he installed a '2'speed-reman-motor/-still inopp.
'any one' got a 'link' or place to find a wiring diagram for a-76 gm
 
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Old 10-06-09, 06:58 AM
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Advise him to buy a manual at auto parts store, if he ever wants to DIY and save money. It sure has saved me, big time.

The bad news is currently you do not know where to look.

The good news is now when you find the wiring diagram, you can breeze over the complex drawing showing internal switching in the motor and concentrate on the wiring outside the wiper motor instead.

Oh. And with your voltmeter, make sure you have confirmed 12 v power through the fuse - not just that the fuse looks good, ands ohms out good.

When my wiper/directional control arm went out, that killed not only outgoing power at the fuse, but incoming power to the fuse terminal! The Mitchell's wiring seemed to indicate power to fuse terminal supplied through the control arm. I replaced the control arm and all was restored!
 
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Old 10-06-09, 09:32 AM
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while 'googling' wiring diagrams,i found a post-you can register your vehicle & some other info.
they have a free - online shop manual-& wiring diagram
 
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Old 10-12-09, 02:50 PM
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I have diagrams for 1976 GM, which should be the same thing. You should have a three terminal connector to the motor and a two terminal connector to the washer solenoid.

On the motor three terminal connector you have the following
1. Yellow/Black is power from the W terminal on the fuse block.
2. Black/White goes back to the dash switch for one speed.
3. Black/Lt Blue goes back to the dash switch for the other speed.

On the washer solenoid two terminal connector, you have the following:
1. Yellow/Black is power from the W terminal on the fuse block (it also connects across to the three terminal connector).
2. Dark Blue/Black goes back to the dash switch for the washer solenoid.

Testing:
1. Check both sides of fuse at wiper fuse to ensure power at fuse block. (Start here because this is usually where the problem will be).
2. Power/Wiring test: Ensure you have power at the yellow/black line. Jump out as necessary to test motor and switch operation.
2. Switch/Wiring test: Test for continuity from ground to Black/White with wiper switch on.
3. Switch/Wiring test: Test for continuity from ground to Black/Lt Blue.

He can bench test the motor by appling power to the middle prong on the three terminal tabs, and ground the other tabs, one at a time.

Good luck and let me know if there is any other information you need.
 
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