wiper circuitson a 1990 defender

Hi tried searching and gaining some knowledge, however my wipers do not park.
They are two speed with a push down swipe function, everything works except the park function.
I have renewed the park switch which was faulty..the plunger spring was u/s.
Anyhow i have learnt how the motor and park function operates but still fail to fully understand the landy version
I remove the yellow wire from the park switch and second speed does not work, remove the red and first doesnt work, remove the blue and nothing works..
What does the blue wire do as i think the motor is self earthing and does the stalk have any input to the park function.
Any other ideas or knowledge to help me would be greatly appreciated:confused

Check to see if the blue is the 12V feed for your park.

You should find a black wire earth from the motor which is then connected to earth via one of the mounting bolts.

On mine the motor body does not earth itself as it sits in a rubber sleeve.

Thanks so far i think i have this going to the motor
Yellow = 2nd speed
Red=1st speed
Blue= negative

At the five pin connector:
Green = ignition live connected to park switch
Green and brown connected to park switch

I am now thinking that the green and brown goes from the park switch back to the wiper stalk and from there via a switch back to the wiper motor via the red (first stage wipe) wire..

That the reason mybpark doesnt function is a faulty wiper stalk...

Sorted, the initial fault was a faulty park swItch however when this failed prior to my ownership the previous owner decided to snip the park switch wires at the the wiper stalk.quick repair and all is ok, thank you.

Pleased to hear that it's all sorted out.