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Alright, so I believe this is what should make the wiper behave. Correct me if I'm wrong.
First, there should always be power and ground to the motor case. This simulates the wiper door open via the override switch.
Then, when the car is on, power is applied to the yellow wire.
When the wiper is off, the green wire is grounded and the blue wire is open (not connected to the ground)
Low speed, both the green and blue wires are grounded.
High speed, just the blue wire is grounded and the green wire is open.
What makes it not work?
If the motor doesn't work at all, then power may not be applied to the motor case and yellow wire or the blue wire between the motor and switch/relay is open.
Only low speed but it does stop? The blue wire between the switch and relay is open. Also, the relay won't click when this happens.
Only high speed but it does stop? Then the black/white wire between the switch and relay is open.
Only high speed and it doesn't stop? The green wire between the motor and relay is open.
If the motor works by applying power/ground manually, then checking the wiper switch and relay is pretty easy.
Then checking wire continuity between the different parts should locate the issue if everything works correctly when tested individually.
Now, it sounds like both your blue and green wires are staying grounded constantly, so I would see where that is happening and it should solve your problem.
On the bench with the motor out of the car,Should power be on the outside of the metal case itself (not the power wire) but the metal housing? My metal housing has 12v and when I ground the case it runs. Not like the video at all
ruken
Last edited by ruken; Dec 8, 2015 at 03:00 PM.
Reason: add info
If.. on the bench.. you apply 12 volts to the number 2 terminal on the motor (center terminal) and you then have power on the case... you've got a motor issue. At no time should the case have 12 volts on it.
Power on the red/white wire 13 and power on 2.
Ground on 4... then add your high speed and low speed grounds 1 - 3 to obtain the appropriate speed and parking.
I if he is applying power to the number 2 connector and the motor case is hot he's got a motor issue for sure. Something is shorted out.
Thank all of you for your reply to the windshield wiper problems. They really helped! This forum is awesome. This vet has many other issues I may need help on. Thanks in advance.
Thank all of you for your reply to the windshield wiper problems. They really helped! This forum is awesome. This vet has many other issues I may need help on. Thanks in advance.
I have a similar issue which I posted several weeks ago. If I apply 12 volts to motor at the plug the motor runs both speeds via the switch. Have 12 volts on other side of connector but when I jump the connector the motor does not run.I had asked where the power originates for that plug but did not get an answer. Maybe that wire has a short and not getting enough amperage to run the motor.Any help would be appreciated.Thanks, Rob ps I have looked at the diagrams, but do not know where components are located to check such as relays.
Hi ct,
The wiper relay is located on the transmission tunnel under the shifter console, forward of the ash tray and cig lighter housing.
NOT easy to get to.
Some people reach it by removing the right side shifter console extension and then reaching in past the side of the radio.
Regards,
Alan
Yes 13 is were I applied the power. Alan, I did some work on the radio recently and maybe I did something to the relay. I will check it out. Everyone, thank you for all the help, Rob
Power for that plug starts at the horn relay (which is always hot even when the car is off), goes through the windshield override switch under the dash, then through the wiper door limit switch, then to the wiper motor.
Start at the motor and measure the voltage. Which should be 0 because it's not working.
Then follow the wire to the wiper door limit switch and measure the voltage on the other side of the switch. If that is 12V, then you may have to adjust the plunger so that it presses the switch better (or replace the switch if it's bad)
If that is still 0, check the override switch under the dash (one side should always be 12V)
If this switch isn't working, it may have to be replaced, but I was able to take mine apart and clean the contacts to make it work.
Then, if that still doesn't show 12V, check the horn relay for power.
It sounds like your wiper motor is working fine, but there is a component that isn't transmitting power or a wire/connection is broken somewhere in this circuit
Last edited by D_Williams; Dec 9, 2015 at 11:06 AM.
Reason: edited for clarity
finally got a chance to do some trouble shooting and have no power all t back to the door relay. Where is the horn relay located? Thanks for all the help, Rob
finally got a chance to do some trouble shooting and have no power all t back to the door relay. Where is the horn relay located? Thanks for all the help, Rob
Found horn relay and have power at both wires coming off relay. Checked after what I believe are fuse able links and have power also. Where do the wires go from there? I saw a white and black I believe on the wiper switch or the relay under the console.Thanks, Rob
Hi Rob,
The horn relay is mounted on the driver's side apron just forward of the vacuum reservoir.
Regards,
Alan
Thanks Alan. I found the relay and need to know the next item to check after the horn relay. The Wilcox diagram explains it, but I am a bit confused as to the sequence. Thanks, Rob
I ordered a new motor and will start over, I believe the motor has a short from battery to case inside.
ruken
Did you check the blower speeds to the HVAC system?? there is a ~10 ga black wire that goes to engine ground on the starter motor, and many guys accidently put it on the battery cable post on the starter solenoid, that would give you a hard 12 volts on the frame of the blower motor, AND the wiper motor, that will negate all other tests and you would always have 12 volts on the motor, no matter what.....
[QUOTE=mrvette;1591146621]Did you check the blower speeds to the HVAC system?? there is a ~10 ga black wire that goes to engine ground on the starter motor, and many guys accidently put it on the battery cable post on the starter solenoid, that would give you a hard 12 volts on the frame of the blower motor, AND the wiper motor, that will negate all other tests and you would always have 12 volts on the motor, no matter what.....
Does this wire have anything to do with the wiper motor? It is a thin red wire that makes a loop. On one end it goes to a double red wire. The other end looks like green, blue or black. see if I can attach pic. Thanks for all the help. Hopefully I will figure this out soon, Rob
Found horn relay and have power at both wires coming off relay. Checked after what I believe are fuse able links and have power also. Where do the wires go from there? I saw a white and black I believe on the wiper switch or the relay under the console.Thanks, Rob
The black/white wire connects the dash ground to the relay, but that wouldn't affect your power issue.
From the horn relay, the black wire (which fuses to a red wire I believe) runs to the wiper override switch under the dash. Check the switch for power on both sides and at least one of them should have a constant 12V. If only one does, try turning the switch.
I had to take apart this switch in my car and clean the contacts to get my wiper to work, so that could be your issue as well
As for that red loop, I'm not sure. Where is it located?
Last edited by D_Williams; Dec 20, 2015 at 04:55 PM.
The black/white wire connects the dash ground to the relay, but that wouldn't affect your power issue.
From the horn relay, the black wire (which fuses to a red wire I believe) runs to the wiper override switch under the dash. Check the switch for power on both sides and at least one of them should have a constant 12V. If only one does, try turning the switch.
I had to take apart this switch in my car and clean the contacts to get my wiper to work, so that could be your issue as well
As for that red loop, I'm not sure. Where is it located?
Thanks DW. The red wire is located near the firewall to the center of the car and under the wiper motor.Where is the wiper override switch located under the dash ? Thanks for all the help out there. With all the relays and switches for the wiper doors this car is giving me fits!
