Silly Question about windscreen wipers

[m4tty]

Hi,

Silly question but i wanted to know ...... when you put your windscreen wipers on the setting to wipe every 5 seconds. How does it count to five. I know its a relay but how do they differenciate between say 3 seconds and 5. Is it solid state electronics or can a relay do the counting. If you can understand what im getting at??

Thanks in advance for any replies.

Cheers

 

[Andy™]

my be a capacitor charging, once its charged, switches wipers on. delay would be by altering charge rate via resistor

 

[bob]

Hi,Silly question but i wanted to know ...... when you put your windscreen wipers on the setting to wipe every 5 seconds. How does it count to five. I know its a relay but how do they differenciate between say 3 seconds and 5. Is it solid state electronics or can a relay do the counting. If you can understand what im getting at??

Thanks in advance for any replies.

Cheers

it uses a 555 timer with a resistors

bob

 

[kme]

Both answers are correct. The newer ones use the chip, whilst earlier models had a charged capacitor.

 

[septiclecky]

I have a VW Golf and the intermittant wipe on mine can vary.

Switch it on first and leave it on and it is approx 5 seconds but if you switch it off and back on again the time is approx 2.5 seconds.

 

[aidanb19]

I have a VW Golf and the intermittant wipe on mine can vary. Switch it on first and leave it on and it is approx 5 seconds but if you switch it off and back on again the time is approx 2.5 seconds.

What age golf is that? With a certain relay (definitely works on mk2 and mk3 golfs, maybe mk1) the time is adjustable

 

[septiclecky]

What age golf is that? With a certain relay (definitely works on mk2 and mk3 golfs, maybe mk1) the time is adjustable

Mk 3

 

[PC Electrics]

On modern cars the timing is done electronically. The timing and switching is done at low current via the electronics which uses a relay to power the wiper motor (they pull up to 20 amps).

 

[Lurch]

When mine worked it was done with far too much electronics, half of which is missing as someone removed the rear view mirror!

 

[bulmer]

What age golf is that? With a certain relay (definitely works on mk2 and mk3 golfs, maybe mk1) the time is adjustable

You're lucky if you can get the wipers on a MK1 working at all:^O

 

[Andy™]

how much electronics can be fitted into a mirror?!

 

[Lurch]

[quote name='Andy

 

[Andy™]

who ripped out the old mirror?

 

[Lurch]

My mate who I bought the car off.

TBF he has said he'll buy me a new mirror and mount, I just need to reconnect it and stick the bracket on the window.