One for the brains trust...

I'm trying to hook up my 2 speed wiper motor but am getting nowhere. I've followed the how to guide but it hasn't helped.
I think I may be missing a wire....and my sanity

Here is what I have:

At the wiper, 4 wires: Black, Red/Green, Green, Black/Green.
At the switch, Black, Red/Green, Black/Green.

Switch is definitely a 2 speed switch (part numbers are 35927/P94317) and has 6 terminals numbered 1,2,4,6,7,8.

When I hook it up as per the how to guide for 2 speed wiring, all i get is a single speed in the middle switch position with no parking. Switch in bottom position turns the motor off, again no parking. I have made sure to earth the motor body to the car body securely as well.

In the how-to wiring diagram, there looks to be a 4th wire going from the switch to the motor which I seem to be missing from my loom. I tried just running a temp wire to see if I could get it working but no go.

I've tried multiple combinations of wiring as well but still no joy.

Any suggestions folks?

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67 Van, 1275cc

You need a Blue/Green wire from terminal 8 of the switch to the wiper motor (as shown). If you don't have one, run one.

Tried that - made no difference.....

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67 Van, 1275cc

Are the 3 copper fingers making good contact with the slip ring underneath?
Is the slip ring corroded at all?

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

New stainless ring installed (thanks Convertible Mini) and the fingers seem to be making good contact.

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67 Van, 1275cc

Have you checked it since fitting, these fingers lead not trail, and the park one can get bent bad if the slip ring is thicker than the plastic lug. I had to chamfer the slot (slip ring from John Smidt) as it was thicker.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Will double check it this weekend, the new ring seemed to fit the drive gear OK though.

Bloody frustrating, last bit of electrical work that needs to be done....

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67 Van, 1275cc

The last 1% usually causes 99% of the stress!

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Cooper S Mk2
Cooper S Mk1
ex Cooper S Mk2, various Morris 1100s, 1300s, 1500s, Leyland Sherpa!

Not bloody wrong! I’m at the last 20% of the build taking 80% of the time stage. I just want to finish the damn thing.

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67 Van, 1275cc

If you want to retain the original wiper motor then you don't have much choice but to keep trying to get it to work. I too spent ages on mine and got nowhere, in the end I swapped in the UK version with the park switch from MS. Works every time now.

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

After making a sacrifice to the Lucas Electrics gods, I pulled the wiper motor apart and checked/cleaned it completely.

Seems to have done the trick as the bloody thing works now.... I did have to add a wire from switch pin 8 to the motor, but I’ve got 2 speeds and self parking!

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67 Van, 1275cc

Good to hear it's sorted.
Maybe a brush was sticking in its holder.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Of course, else you don't get the second speed.

When I ordered my loom I mustn’t have specified the 2 speed wiper, hence the need for the additional wire.

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67 Van, 1275cc