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Topic: Wiper Motor Ground?

in Forum: C3 Electrical

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Wiper Motor Ground? (1/9)
7/29/09 6:59am

bio11
Former Member
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Oklahoma City, OK - USA

Vette(s):
1972 LS5 Convertible,Auto.Targa Blue with Black Interior.

Joined: 4/1/2007
Posts: 432

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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Wiper Motor Ground? (2/9)
7/29/09 8:33am

aceinthehole

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Manteca, CA - USA

Vette(s):
1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed

Joined: 11/20/2005
Posts: 3623

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.

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Jimmy B.
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Wiper Motor Ground? (3/9)
7/29/09 9:52am

rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1171

Looking at the wireing diagram the ground should be the same black wire ground as the Blower motor

Wiper Motor Ground? (4/9)
7/29/09 11:11am

aceinthehole

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Manteca, CA - USA

Vette(s):
1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed

Joined: 11/20/2005
Posts: 3623

Thanks Robert, that would explain why I didn't recognize it. that's a slip on plug on my motor.

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Jimmy B.
Just can't wait to get on the road again.

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Wiper Motor Ground? (5/9)
7/29/09 2:50pm

whtlitnin

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VENTRESS, LA - USA

Vette(s):
1971 Blue Roadster, sb400, cam, electronic ignition,10 disc CD changer, 2.5" chambered exhaust, 3.36 rear,tremec 5 speed from Classic Chevy, fiberglass rear spring and vintage air.

Joined: 10/8/2003
Posts: 87

I think on my 71 the wiper motor grounds through the dash switch.

Wiper Motor Ground? (6/9)
7/29/09 7:46pm

Adams' Apple

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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: 20203

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.

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Joel Adams
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Wiper Motor Ground? (7/9)
7/29/09 8:38pm

bio11
Former Member
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Oklahoma City, OK - USA

Vette(s):
1972 LS5 Convertible,Auto.Targa Blue with Black Interior.

Joined: 4/1/2007
Posts: 432

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

Wiper Motor Ground? (8/9)
7/29/09 9:20pm

anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 784

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 anips2009-07-29 21:33:21

Wiper Motor Ground? (9/9)
7/30/09 6:48am

bio11
Former Member
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Oklahoma City, OK - USA

Vette(s):
1972 LS5 Convertible,Auto.Targa Blue with Black Interior.

Joined: 4/1/2007
Posts: 432

Thank's anips..I'll put it on that one, that makes more since than the one on top. That way it's down out of sight.

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