10 replies to this topic

[stevelane]

Have just fitted a new park motor to the windscreen wipers but still it stos wherever you turn them off, any advice?

[cal844]

Check the stalk switch

[stevelane]

Check the stalk switch

can you elaborate for an idiot lol? What am I looking for?

[robminibcy]

It will almost certainly be the park switch:

http://www.minispare...ic/520160A.aspx

[stevelane]

It will almost certainly be the park switch:
http://www.minispare...ic/520160A.aspx

it's a brand new switch, had done exactly the same with the old one as the new one

[dklawson]

Forgive the techno babble but to troubleshoot the motor/switch it helps to understand what is supposed to happen.

• 12V is supplied to the wiper motor anytime the ignition is on.  
• That 12V at the motor passes through the park switch and is returned to the control switch in the car.
• When the wiper control switch is in the "OFF" position, that 12V from the motor park switch passes through a set of contacts and is connected to the motor's low speed windings.
• That 12V supplied to the motor's low speed windings will keep the motor running until the park switch opens OR you turn off the ignition.

So... power into the motor, out the park switch, through the control switch, back to the motor on the low speed wire.

 

To carry out your troubleshooting, see the picture linked below (Courtesy of Holden.co.UK).  With the key in the run position you should find 12V on the "feed from ignition" terminal.  If you don't find 12V there... use your wiring diagram to find out why.  The 12V should exit the wiper motor on the terminal marked "connection to switch".  If you don't have 12V there, either the motor is already parked... or the switch is bad.

 

The second picture below (from a Cobra car web site) shows the same motor connector (however... mirrored both horizontally & vertically) and the control switch.  In the second picture the red lines trace the connections when the control switch is in the "OFF" position.  Unfortunately... it also shows the park switch "open" such that the motor would be "parked".  Study the picture and focus on how current would flow if the park switch (plunger shown in the motor connector) were not open... if the plunger was "up" Study the two pictures for a while until you have some feel for how it is supposed to work and I am sure you will have no trouble sorting this out.

 

 

[stevelane]

Thanks for all your advice as usual, very informative, unfortunately the heavens have opened so i think my tinkering is over today but I will print out your advice and get bac k to it when I can

[Ethel]

If they stop where they are on being turned off, then there's a break in the circuit through the park switch. If it's not the park switch then the next biggest suspect would be the contacts on the stalk. To test, unplug it and join the corresponding pins on the car side of the plug - red/green to brown/green

 

pinched from http://www.mgb-stuff.org.uk/wiper4.htm

[dklawson]

Great schematic Ethel !  Thanks for posting that !

[Ethel]

That web site's got lots of goodies that apply equally well to Mins.

[stevelane]

If they stop where they are on being turned off, then there's a break in the circuit through the park switch. If it's not the park switch then the next biggest suspect would be the contacts on the stalk. To test, unplug it and join the corresponding pins on the car side of the plug - red/green to brown/green

 

pinched from http://www.mgb-stuff.org.uk/wiper4.htm

Thanks for this, sorry I didnt answer before but not been able to get on here - Weather permitting I will give this a go tomorrow - Really appreciated