Rear wiper motor shorting

[Aquarian51]

I noticed the other day that when I use the rear door wiper my voltmeter does a big dip down below 8 volts each time the wiper does a sweep across the glass. I've had a quick look and can't see any obvious sparks or wearing of insulation of the wires. It hasn't blown a fuse - as yet. Any ideas: is it a common fault, things to look at or check? Advice gratefully received. Thanks

[Bigrig]

Hey mate - the wiper motors have a tendency to die and are fairly cheap and easy to replace - I'd suggest checking the wiring from the motors first, but if no obvious signs or issues, then possibly replace them (may as well do both for the cost and effort whilst doing it).

[patch697]

Hey mate - the wiper motors have a tendency to die and are fairly cheap and easy to replace - I'd suggest checking the wiring from the motors first, but if no obvious signs or issues, then possibly replace them (may as well do both for the cost and effort whilst doing it).

You talking Wiper motors or washer motors here Bigus?

[patch697]

I noticed the other day that when I use the rear door wiper my voltmeter does a big dip down below 8 volts each time the wiper does a sweep across the glass. I've had a quick look and can't see any obvious sparks or wearing of insulation of the wires. It hasn't blown a fuse - as yet. Any ideas: is it a common fault, things to look at or check? Advice gratefully received. Thanks

I had a similar issue & found that dust had got into every part of the wiper assembly & after a removal rigorous cleaning & a good spay with dir lube it was all good again.

Its not a fun job but all it cost me was time & the end result was worth the trouble.

[Ben-e-boy]

Hi

I had a similar problem at work a couple of days ago where a plug for a hydraulic valve had a nic on the cable inside the plug and it was dragging the voltage from 240 when disconnected to 27 connected without blowing fuses or breakers what I refer to as a "long short"

What I would do first is disconnect the motor from the circuit the turn the wipers on. If the voltage still drops you have a cable fault if it dosnt you have a motor fault
If you have a cable fault thoroughly inspecting the cables. If its a motor fault I would do as patch said by cleaning but use "CONTACT CLEANER" its readily available. Its a solvent designed for use on electrical and electronic equipment failing that get a new one

Hope this helps
Cheers
Benny

[patch697]

Hi

I had a similar problem at work a couple of days ago where a plug for a hydraulic valve had a nic on the cable inside the plug and it was dragging the voltage from 240 when disconnected to 27 connected without blowing fuses or breakers what I refer to as a "long short"

What I would do first is disconnect the motor from the circuit the turn the wipers on. If the voltage still drops you have a cable fault if it dosnt you have a motor fault
If you have a cable fault thoroughly inspecting the cables. If its a motor fault I would do as patch said by cleaning but use "CONTACT CLEANER" its readily available. Its a solvent designed for use on electrical and electronic equipment failing that get a new one

Hope this helps
Cheers
Benny

I should have been a little more descriptive & said I sprayed the moving parts with dry lube & not the internals of the motor itself.

Cheers Benny & top tips to mate.

[Aquarian51]

Thanks Benny. I'll try that to establish what is at fault. Will post the result so it may help others in the future.
cheers
Len

[patch697]

Thanks Benny. I'll try that to establish what is at fault. Will post the result so it may help others in the future.
cheers
Len

Good onya Len & best of luck mate.

If you get stuck just jump on & someone with be sure to help out.

[Yendor]

Does the voltmeter also drop when you use other electrical items such as indicators or when headlights are turned on?

If so I would check the main earth that runs from the negative side of the battery to the body, is it clean and tight?, also I would check the main earth for the dash, from memory it connects in the panel around the inside fusebox.

Does the rear wiper move slowly or is jerky in it's movement? I would try lubing up the wiper mechanism as per Paul post.

[Ben-e-boy]

Does the voltmeter also drop when you use other electrical items such as indicators or when headlights are turned on?

If so I would check the main earth that runs from the negative side of the battery to the body, is it clean and tight?, also I would check the main earth for the dash, from memory it connects in the panel around the inside fusebox.

Does the rear wiper move slowly or is jerky in it's movement? I would try lubing up the wiper mechanism as per Paul post.

If the main earth has a high resistance joint you will have more issues than just the wipers