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Rear wiper died

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Old May 4th, 2020, 23:30   #11
R-P
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I think there was someone offering the spindle (I always refer to it as toothed gearwheel as I am not a native speaker) after painstakingly writing a program to 3D print it correctly.

But strangely enough, there was very little demand...

It the wiper does half swipes and you hear something like a relay ticking, this is a clear indication it is about to die: the ticking is a temperature controlled overcurrent switch: too much current and it trips. When it cools, it tries again.

I did a lengthy post about my ventures, but all pics disappeared. Mine was caused by wateringress between the axle and the housing. The rust expands compared to a smooth axle and thus the current needed kept increasing. BUT once I had fixed this, the current needed was still 10 times more than a smooth running wiper! Turned out the bearings of the motor were also seized.

BEWARE when taking the motor apart, if you put it in the wrong way round (or was it putting the carbon-brushes the wrong way round?), the wiper will move in the wrong direction a little bit before going in the correct direction, so you end up wiping your boot-door instead of just your window.

(Ask me how I know this...)
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Old May 5th, 2020, 07:25   #12
TLPower
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@calstu, I also bought an Ebay replacement unit with the same consequences. I pulled all the loom out to the motor and removed all the tape hoping to find a short, none was found. After much head scratching I checked the continuity on the plug on the new wiper and it had a dead short. Consequently I stripped the original, freed off the spindle, cleaned the brushes, the commutator and it now works fine.

I couldn't be bothered to get a refund for the new one, I dare say I'll strip it at some point.
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Old May 5th, 2020, 11:40   #13
barrybritcher
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rain x!
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Old May 5th, 2020, 14:33   #14
reggit
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Mine waited until I ordered replacement parts and then sprang back into life!
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Old May 6th, 2020, 17:20   #15
Calstu
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Quote:
Originally Posted by TLPower View Post
@calstu, I also bought an Ebay replacement unit with the same consequences. I pulled all the loom out to the motor and removed all the tape hoping to find a short, none was found. After much head scratching I checked the continuity on the plug on the new wiper and it had a dead short. Consequently I stripped the original, freed off the spindle, cleaned the brushes, the commutator and it now works fine.

I couldn't be bothered to get a refund for the new one, I dare say I'll strip it at some point.
Thanks for that. I'd been desperately trying to avoid having to strip the panels to inspect the loom. I've checked continuity across the connector pins of the replacement motor and I only get it between the outer pins (Live for normal/intermittent?) and not to the centre pin and the original motor is the same. Is this the same short you had?
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Old May 7th, 2020, 17:45   #16
TLPower
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My high quality item has continuity across all three pins. Removing all the trim to access the loom isn't that bad as a job. I seem to remember the boot aperture trim came out first, then the boot floor, then the side window.

I'll strip the new unit tomorrow and report back.
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