Improving wipers

Juular · Dec 21st, 2022, 14:18

I know the 240 is known for having sluggish wipers, but something really isn't quite right with mine.

Normal speed is just about alright, but I still feel it lacks power, and if the screen isn't actually saturated with rain the wipers judder and jump quite badly. This is with both a brand new windscreen and new wiper blades by the way.

The other problem is that setting them to high speed doesn't actually speed them up at all, they run at the normal speed.

The motor itself I have completely stripped and rebuilt with new brushes and shaft bearing, repacking it with grease. On the bench the motor is quiet, powerful and quick. When I feed voltage to the high speed pin the motor runs about twice as fast. I think I can eliminate the motor.

Without the motor attached I can move the wiper mechanism under the dash by hand without any resistance at all, so it's not seized or binding.

What's left.. the wiring from the column switch works correctly, tested with a multimeter showing that high speed setting supplies the high speed pin as it should.

I've beefed up the earth on the motor by running a thick cable from the case straight to the battery negative.

The only thing left is to check is the relay and any grounds that supply the motor feed. Does anyone know what and where to check on this front? Would a failing relay cause slow wipers? Where actually IS the relay?

It could be that although the motor is getting the right feed, there's resistance somewhere along the way?

Bob Meadows · Dec 22nd, 2022, 10:43

May be worth checking the wiper arm spindles & associated moving parts to make sure they are all free to move.
Good luck,
Bob.

SnineT · Dec 22nd, 2022, 10:48

The best way to avoid judder is to keep the screen screen polished with Windex etc and then on a cloth spray some on it and draw the cloth through the wiperblade rubber, you'll be astonished how much black muck comes off of them.

Big 240 · Dec 22nd, 2022, 22:17

I'll be keeping and eye on this, I read on Turbobricks that improving the earth connection helps, but I can see you've done that.

http://forums.turbobricks.com/showthread.php?t=309689

Have a look at this too, might help with the judder:

+ YouTube Video

Dec 21st, 2022, 14:18	#1
Juular Senior Member Last Online: Yesterday 21:11 Join Date: Sep 2020 Location: Falkirk	Improving wipers I know the 240 is known for having sluggish wipers, but something really isn't quite right with mine. Normal speed is just about alright, but I still feel it lacks power, and if the screen isn't actually saturated with rain the wipers judder and jump quite badly. This is with both a brand new windscreen and new wiper blades by the way. The other problem is that setting them to high speed doesn't actually speed them up at all, they run at the normal speed. The motor itself I have completely stripped and rebuilt with new brushes and shaft bearing, repacking it with grease. On the bench the motor is quiet, powerful and quick. When I feed voltage to the high speed pin the motor runs about twice as fast. I think I can eliminate the motor. Without the motor attached I can move the wiper mechanism under the dash by hand without any resistance at all, so it's not seized or binding. What's left.. the wiring from the column switch works correctly, tested with a multimeter showing that high speed setting supplies the high speed pin as it should. I've beefed up the earth on the motor by running a thick cable from the case straight to the battery negative. The only thing left is to check is the relay and any grounds that supply the motor feed. Does anyone know what and where to check on this front? Would a failing relay cause slow wipers? Where actually IS the relay? It could be that although the motor is getting the right feed, there's resistance somewhere along the way?

Dec 22nd, 2022, 10:43	#2
Bob Meadows Premier Member Last Online: Yesterday 19:33 Join Date: Sep 2017 Location: STANDISH LANCASHIRE	May be worth checking the wiper arm spindles & associated moving parts to make sure they are all free to move. Good luck, Bob.

Dec 22nd, 2022, 10:48	#3
SnineT Extrahumanestrial Last Online: Feb 13th, 2023 19:02 Join Date: Jun 2022 Location: Budapest	The best way to avoid judder is to keep the screen screen polished with Windex etc and then on a cloth spray some on it and draw the cloth through the wiperblade rubber, you'll be astonished how much black muck comes off of them.

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