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Old 03-29-2020, 05:13 PM   #1
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Brand: Thor Motor Coach
State: Pennsylvania
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THOR #18469
Help! Wiper motor relay

Hi! New to the forum..I have a 1996 Thor Hurricane. Weíve owned the RV for 15 years and itís really been good to us. However weíve recently ran into a wiper motor issue. The motors will randomly turn on and off without any control. We actually had to take the blades off towards the end of summer to use the RV. So Iíve recently started diagnosing the issue. The motors seem to be working fine. The switch is also working good. The problem seems to be in the wiper relay control module. Itís corroded and doesnít look to be in to good of shape. The problem is I canít find a part number anywhere and trying to find this online has lead me no where. Any advise? See photos...
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Old 03-29-2020, 07:28 PM   #2
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THOR #7035
Wouldn't that be a standard FORD part? Not sure what comes with a striiped chassis and where the FORD/THOR delineation occurs in that system.
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Old 03-29-2020, 10:20 PM   #3
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THOR #16471
Saving the circuit board

Hi, maybe you can save the board by cleaning it with a small stiff brush and some isopropyl alcohol (I know it is dear at the moment). Just carefully work at the corroded areas and clean the remainder some what. If there are no damaged parts, just cleaning the corrosion betwixt the traces will do the trick as the corrosion will cause continuity and do funny things.
Good luck!
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Old 03-30-2020, 03:16 PM   #4
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THOR #2154
I believe also that would be a Ford part; hopefully a Ford dealer can help identify it.

No use in trying to clean the board however. I can see from the photo that several components are charred where they have overheated and are destroyed.

Doing a quick Google search, I found what looks to be this part several places. I searched for Ford wiper controller, etc.
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Old 03-30-2020, 07:29 PM   #5
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THOR #18441
Quote:
Originally Posted by Kawasakirider23 View Post
Hi! New to the forum..I have a 1996 Thor Hurricane. Weíve owned the RV for 15 years and itís really been good to us. However weíve recently ran into a wiper motor issue. The motors will randomly turn on and off without any control. We actually had to take the blades off towards the end of summer to use the RV. So Iíve recently started diagnosing the issue. The motors seem to be working fine. The switch is also working good. The problem seems to be in the wiper relay control module. Itís corroded and doesnít look to be in to good of shape. The problem is I canít find a part number anywhere and trying to find this online has lead me no where. Any advise? See photos...
Actually if you remove the WIPER MOTOR itself and on a clean surface Open the motor you will find that the contact area inside the motor is full of Grease thus causing your wipers to continue to operate or come on at times they are not needed or even Continue to run until the fuse is pulled thus disconnecting the power source
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Old 03-30-2020, 07:34 PM   #6
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THOR #18441
Clean the inside Of the wiper motor itself of Greece the grease inside the wiper motor is causing the contacts to short out amongst one another I speak from the experience of having to do this on a 2017 Thor hurricane model best of luck
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Old 04-01-2020, 07:32 PM   #7
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THOR #18469
Tore the motor apart and everything looks fine in there...the contacts are not dirty. Still no luck with the dealership either
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Old 04-01-2020, 09:38 PM   #8
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For the motor to run (even intermittently as in your case) it requires an external voltage pulse. From schematics I reviewed, there is a + wire that goes to the motor control you show (#4 or the 2nd from the left) so if there is enough conductive dirt in that connector and your picture does show a very dirty motor connector, then maybe it would operate. So, clean that motor housing and connector with varsol or some parts cleaner to get the grime off.

I would still try washing the circuit board with iso, I do not see why it would be of "no use" as you did go to all the trouble of removing the motor. I do see where there may be burnt electronic parts, but until you try....
Good luck
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