I have a complete Mini wiper system. The motor is marked 14W PARK, 75739J, 12V, 14, 87, 54072108. It has three cables from the motor to the multi connector that are yellow, red and blue. I am assuming that two go to my wiper switch (Sierra steering column and arms) and one to a constant live feed for the self park. Am I correct and which lead goes where? Anyone know the answer? Cheers.

Classic Mini, or modern BMW Mini?

"14W" suggests that it's a Lucas system from an old mini...

[Edited on 17/7/10 by David Jenkins]

Sorry, should have said classic Mini.

There's a bit of a discussion about these here (see page 3 for wiring) and some more tech info here

Looks like your 3 wires are for speed 1 and speed 2, and there should be a pair of other contacts for the park function?

Ed.

The wiring for a Lucas 2-speed wiper motor is... erm... eccentric, to say the least. The simplest solution is to use a Lucas wiper switch, designed for the job.

I've decades of experience with relays and switches, and I couldn't be bothered to work out how to use the Sierra switch to operate the wipers. In the end I did it my own way, with a better-looking switch than the Lucas one.

Have a look at this thread for a previous discussion.

[Edited on 17/7/10 by David Jenkins]

I have Sierra switch's and a Lucas wiper motor using the intermittant relay although I have a Premier wiring loom. IIRC someone on the RHOCAR website has posted a wiring diagram which may be of help?

It should be something like this:



Wiring diagram mini wiper

Wish I'd seen the diagram. I worked it outmyself. The details are on my website. I made my own intermitent wiper out of a 555 astable with some diodes to get the duty cycle <50%.

^^^ That's exactly the diagram I used. Works as advertised - two speeds and parking.

From my website (STM loom). Hope it matches the above!

Pin Number Loom colour Stalk terminal
1 Black n/a
2 Brown/Green Rs53B
3 Blue/Green Rs53
4 Red/Green RsB1
5 Green n/a

The intermitent wiper function works as follows. A wire is taken off the junction of RsB1 and the Red/Green loom wire- this goes to the N/C terminal of a relay. The common goes to RsB2. The N/O contact is connected to 12V. Rs53-2 (only on when intermitent is selected) is used to power a 556 (dual 555 astable/monostable). The first 555 is used in variable astable mode (the wiper speed is therefore adjustable). The second 555 is used as a monostable to provide a pulse to the relay. This switches the motor from park to normal speed. This pulse needs to be long enough to get past the park position. This is probably in the region of 1/4 second.

The thing that worries me about that diagram is that the full motor current (about 4 - 8 Amps) goes through the Sierra switch's contacts - and they were only ever designed to operate relays.

However - if it works - who am I to criticise!

Could relays just be added, and put in line with the Sierra switches? I haven't used anything from a Sierra, I'm just curious. Relays are free if you look around, or cheap if you can't be bothered.

Ive just found a wireing diagram on the Car Builders Solutions web site catalogue. It may be the same as one of the answers here. Thanks for all the answers. I think I will go with a seperate switch rather than try and use the Sierra column one.

Wiring between Mini wiper motor and sierra switch is given on Rob Lane's website under "cars data" http://www.robs7.com/

It's how I did mine - and it still works perfectly 8yrs later

Apologies if it's the same as any of the answers posted above.

Will this work?



Will this work?

This is what I did - the only special requirement is that the the switch has to be a headlight switch - the type that goes OFF - Sidelights - Sidelights & Headlights. There are dozens of them available in all shapes & forms.


wiper wiring diagram

I haven't done the int wipe bit yet - I'll sort that out some other time.

Don't think my diagram has that special requirement...

Steve,

The problem with your diagram is that you could put both switches on, which would supply power to the high and low speed windings at the same time - not good!

Good point, well made. However this should not be possible with a stalk-mounted control...or 3 position toggle.

Stephen

[Edited on 18/7/10 by stevebubs]

In that case - it *may* work OK - but don't hold me to it!

How about this one, then....moves the 12v supply to Speed 1


This one prevents both on

You may be interested to know that your wiper motor was made in wee 14 in the year 1987 !

Regards Steve @ sVc