Topic: Wiper Motor Ground?
in Forum: C3 Electrical
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My 72 had no wiper motor when I bought it...among other things...I have installed a new motor and all new wiring harnesses. But I can not find a picture or anything that shows me where the ground wire attach's to the wiper motor. I've looked all through my AIM manual and every other book I have and can't find a picture. Things I have seen it looks like it attach's to one of the mounting bolts for the wiper motor. I have the little spade for the wire to plug onto, I just don't know which bolt to put it on. If anyone has a Pic I would greatly appreciate it.
Thanks
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Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
I only have the later models to go by and a pic wouldn't do it. I tried unwrapping the wires going to the motor but it's not obvious (didn't find a green one). Only a wiring diagram will tell the story. Some guys here are able to come up with the diagrams so hopefully they'll notice this thread and come to the rescue.
Jimmy B.
Just can't wait to get on the road again. 
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Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
Thanks Robert, that would explain why I didn't recognize it. that's a slip on plug on my motor.
Jimmy B.
Just can't wait to get on the road again.
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I think on my 71 the wiper motor grounds through the dash switch.
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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 motor casing should be grounded, and it is the same wire that runs to the blower motor. The wiper switch[/]also must be grounded for the wipers to work properly. The wiper motor has 12v on it at all times with the key on. The wiper switch provides the ground for the different wiper speeds.
Since I re-formatted this 'puter, I haven't reinstalled my wiring diagrams, so I can't help with that, but I'm sure Bob is correct.
Since I re-formatted this 'puter, I haven't reinstalled my wiring diagrams, so I can't help with that, but I'm sure Bob is correct.
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
OK....so my ground spade needs to be on the motor casing....that is what I needed. I looked at a bunch of Vetts for sale on the internet today trying to find a pic to show me which bolt to attach it to. I did find one pic that looked like it was on the top small bolt on the casing. I had it on one of the small bolts that mount the motor to the firewall but I thought about it an those have the rubber grommets on them so I didn't think that would ground the motor. I'll put it on tomorrow.
Thanks everybody
on my 72 there is pigey back connector with two black wires coming out of it with a 90 degree spade conn. held on by I believe a 8/32" hex head bolt with intergradeded flat washer at the 5 o'clock position that bolts the two halves of the case together anips 2009-07-29 21:33:21
in Forum: C3 Electrical
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