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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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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
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
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.
Joel Adams
C3VR Lifetime Member #56 
My Link 
(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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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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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
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
I'll email you one test chart to check out. I can also send you wiring diagrams if needed. 
Joel Adams
C3VR Lifetime Member #56
My Link
(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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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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in Forum: C3 Electrical, Body and Interior
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