wiper switch issues? - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 4 (permalink) Old May 9th, 14, 2:54 PM Thread Starter
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wiper switch issues?

I have a 71 convertible I bought with serious wiring issues - so I have no idea what worked or didn't prior to me owning it.

I just finished rewiring my 71 with an american auto wire harness.

No issues there.

However - the wiper switch is giving me grief - I think - unless it is a ground issue?

the wiper motor only works when the button is depressed to make the squirters work - then they run for the 3-4 wipes and park

There is nothing in the on low speed or high speed functions - not even a shudder

Could this be a gound issue or is it the switch gone bad.

The AAW instructions say the three wires to the switch are actually grounds - there is not live 12V that actually goes to the switch.

The SS Gauge panel does have the ground strap from headlight switch to wiper switch - but I don't see anything other than the strap being screwed to the steel dash support bracket. Does there need to be an actual wired ground from the ground strap to the chassis/body? I would have thought that having the dash bracket bolted to the body would be ground enough?


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post #2 of 4 (permalink) Old May 9th, 14, 3:34 PM
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Re: wiper switch issues?

I can't tell you what's wrong but from experience with older cars and my 64 its usually a grounding problem. Usually you will have one power to the motor that's fused with a 20 amp and the rest are wires that go to ground.
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post #3 of 4 (permalink) Old May 9th, 14, 4:36 PM
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Re: wiper switch issues?

Make sure the switch is grounded well. I have seen wiper switches with excess play that just will not work right. Even after taking them apart cleaning and reassembly. Also the ground strap will need a clean metal surface to get a good ground. On the 65s ONE screw is all that holds the groung strap to the metal dash opening. I have seen some people make a separate ground wire and attach it between the strap and the firewall. You want clean metal to get a good ground. I recently fixed a Camaro where all the grounds were not clean. They had a high build of paint. This car was backfeeding power all over the place.

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post #4 of 4 (permalink) Old May 9th, 14, 7:11 PM
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Re: wiper switch issues?

It's absolutely critical you have the wiper switch/headlight switch ground strap assembly in place. The 2 holes represent where the screws go thru to both physically hold the switch ears in place as well as transfer the ground.

No good ground at wiper switch housing=no wipers PERIOD.

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