Home page

Support our Vendors!  |  Advertise Here

NEW! Check out our new Corvette Quiz!

Topic: Wiper motor ground

in Forum: C3 Electrical

Already a Member?
Not yet a Member?
Register for Free!

Wiper motor ground (1/3)
 7/12/23 2:57pm
Limited Member
Send Private Message

Joined: 7/4/2023
Posts: 10

 Ok, my electrical ignorance is showing again -

72 coupe, wipers not working. I noticed an electric tab near the wiper motor body with no connection.

 If I run a ground to this tab, the wipers work.

What confuses me is this tab has a steady 12 volts going through it, even with the key off - is this normal for a ground connection ? I don't want to run a permanent ground to it and cause a short circuit or something ?




Our Sponsors help support C3VR
Re: Wiper motor ground (2/3)
 7/12/23 10:30pm
Adams' AppleLifetime Member
Lifetime Member
Send Private Message

Duncanville, TX - USA

#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: 20144

Wiper motors have 12v at the connector all the time. The wiper SWITCH is the ground. 9 times out of ten, the problem is the switch itself is not properly attached/grounded to the dash, thereby providing a good ground thru the switch. The "extra" terminal you see is probably for a wire from the blower motor ground. Myself, and others have sometimes added a redundant ground wire to the switch where it attaches to the dash bezel to make sure it is well grounded. I have some wiper troubleshooting stuff here somewhere...I think. Lemmie look...🧐


Joel Adams
C3VR Lifetime Member #56    

My Link

(click for Texas-sized view!)

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

Re: Wiper motor ground (3/3)
 7/13/23 5:13pm
Limited Member
Send Private Message

Joined: 7/4/2023
Posts: 10

 I believe you are correct again !

 I found a black wire nearby that had a proper clip for that terminal, so I unhooked the fan motor ground wire and did a continuity check, which I assume indicates that it is the same wire, or at least part of the same ground system. So I plugged it into the tab on the wiper motor. So far, so good.

 I do use a battery disconnect when not driving until I get the wiring sorted out. And there is a fire extinguisher handy at all times, just in case.

Our Sponsors help support C3VR