wiper motor

[jusbo]

holy crap this is bugging the crap out of me!

Sitch-e-ation: Turn wipers on...low...no work....high...no work....off...off.



I figure its the motor so I pull the wiper motor off my unfinished blazer...it doesn't work either.....I hooked my DMM (multi-meter) up to the "low" (while on low) reads 12.3V, same results on "high". I then think well it should work I am getting the proper voltage to it, I'll get a new motor...well THAT doesn't work either. So that leads me to believe I have a bad ground because the switch works, and I am getting proper voltage to it....



So I bet you are thinking...."he has a ground problem" You are right...but if you have noticed the wiper motor is not connected (ground wise) to the body, its separated by rubber standoffs.



What in the world can I do?

[355V8S10Tahoe]

If you look closely at those rubber mounts you should see a flexable ground strap running around one of them, that would be your ground when bolted to the firewall... Check to see if you have continuity with a v.o.m. between the wiper motor case and the firewall or chasis... If you have a bad ground, I would check for that ground strap I mentioned above, also check for loose bolts, clean the bolts if rusted and believe it or not painting stuff can also cause a bad ground at those bolts... I have had bad grounds at alternators because brackets were painted before... If you have intermitent wipers, they are notoriuse for having a bad electronic delay circuit board inside, just get another from the junk yard in that case...

[smallblock283]

when i got my blazer there was a wire ran from the wiper motor to the brake line via a two gater clips. i did nt know why so i took it off the woman said the wiper didnt work . i put back on and it works . so put a ground wire on it my buddys z 71 did the same thing

[Ryoung68]

Did you check the wiper motor voltage when the wiper switch is in the off position? Some circuits are hot all the time and the switch just supplys a ground for the circuit. Just a thought ran into that with an electric fan bypass switch.

[jusbo]

yes there is a constant hot...i think its the white wire. i checked.

[jusbo]

damn grounds....

I took jumper cables and hooked them up to my (-) and then hooked it to the wiper motor housing....flipped the switch....zap.....it worked. NOW tomorrow (after fixing my girlfriends blown head gasket) I will run a wire from that to the chasis.



Hope that helps someone!