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Topic: Wiper motor won't run

in Forum: C3 Electrical

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Wiper motor won't run (1/5)
9/19/16 4:46pm

BillHanna
Standard Member
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Cana, VA - USA

Vette(s):
1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box

Joined: 7/3/2016
Posts: 319

I recently bought a 75 Vette, and while the body and frame are in great shape, the electrics had been hacked to death.

There was no wiper switch, so while waiting on a new one, I wired two of the contacts to a switch, and the wipers ran on high speed.

Now I have the new switch, but the only way the wipers will operate is when I hold down the "wash" button. No matter how I wired it, that is the only way it would run. I tried my old temporary switch again, but the wipers would no longer run like they would (at high speed).

Do I have a bad motor control, or ???

You guys have been great with my questions so far!

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Re: Wiper motor won't run (2/5)
9/19/16 10:11pm

Adams' Apple

Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20129

The wiper switch HAS to be grounded to work, so first make sure it is grounded.It normally grounds thru the cluster panel, but a lot of times the screws that hold the panel to the dash just don't make good contact. A lot of folks will run a ground wire(with an eyelet terminal) from the dash up to the switch just to have a good ground.

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Joel Adams
C3VR Lifetime Member #56
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(click for Texas-sized view!) NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Re: Wiper motor won't run (3/5)
9/20/16 10:08am

Adams' Apple said: The wiper switch HAS to be grounded to work, so first make sure it is grounded.It normally grounds thru the cluster panel, but a lot of times the screws that hold the panel to the dash just don't make good contact. A lot of folks will run a ground wire(with an eyelet terminal) from the dash up to the switch just to have a good ground.

I checked and it is grounded -- I added a ground just to make sure, but it still does not work.

Any other ideas?

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Re: Wiper motor won't run (4/5)
9/20/16 1:37pm

Adams' Apple

I'll email you one test chart to check out. I can also send you wiring diagrams if needed. Thumbs Up

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Re: Wiper motor won't run (5/5)
10/7/16 11:03am

69CRUZR
Limited Member
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Davidson, NC - USA

Vette(s):
1969 CAN-AM White(972) / Blue (411) Base Coupe. 350 Cu In / 300HP, THM Automatic. PS, PB, PW, Posi, SS Calipers, AM-FM Stereo, '69 Style Side Pipes. Vin: 194379S733381

Joined: 7/11/2012
Posts: 9

Here's a link to a Wilcox Corvette video on testing a 68-76 wiper switch:

https://www.youtube.com/watch?v=6Fnjr9T7cao

Wilcox has a ton of Tech help info:

http://repairs.willcoxcorvette.com/

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�69CRUZR

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