Thanks to Rich for his help and also digging in the loft for my spare wiper column switches I think I might have it sussed.
Turns out the wiring diagram I copied from a Ford manual for the wiper switch schematics is not quite correct for my actual switches. There is a spare spade terminal (31b2) that I always wondered what it was for that is not part of the multiplug connectors.
It's the top terminal in the photo;
This terminal connects to the 53 terminal of the switch when put in the intermittant position.
Looking at Rich's schematics for the Golf shows the relay is wired a little different to my motor wiring.
M2 is the motor, K8 is the relay and S8/S10 is the column switch.
The trick will be to see if I can make some temporary 'bridge' cables up to swap the connections around in the column to check it works. I don't want to chop any wires until I'm sure it's the correct thing to do.
I've redrawn my wiring (need to draw it in a more tidy layout but it will do for now) and I think this is correct. The big difference with the VW 99/19 relay compared to mine is the low speed circuit is only connected to the switch via the relay - the Porsche relay has it wired to the switch directly.
Sorry I'm late to the party! I've been reading up but I'm a bit tied up at the moment. My beloved employer seems to want me to actually go into the office so it's some long days. Meh.
The bit I'm slightly struggling with at the moment is the diagram of the wiper switch and exactly which contacts get connected to what at the various positions. I tried to find another drawing of it on the train on the way home tonight and failed. Need to have a proper look.
Intermittant (No3) 53 connects to 31b2 (this might be a red herring!!!!) as 54 connects to 53-2 (which is the intermittant relay on a ford) Off (0) 53 connects to 31b low speed (1) 53 connects to 54 High speed (2) 53B connects to 54
Some of that black drawing is wrong - I'm working on it now!
53C connects to earth and is the screenwash switch.
Hope that helps and you can add some input, thanks!
So I've just got home ready for an evening of thoughtful pondering only to find you've spoiled my fun by fixing it. Bah, you can go off some people! I'm going to claim my brilliance shone like a torch leading you towards the answer though.
I'm also going to stop talking complete toss and just say 'well done'.
The problem was it needed an extra feed spliced off the low speed circuit to make the timer circuit work. Yay! we have programmable intermittant. EXCEPT..........we now no longer have high speed??? - on high we have no wipers at all??
Low speed still works ok.
Pull the relay and high speed is back again....hmmmmm
For the connections of the switch - the answers are yes.
For the motor - I'm not totally sure! I cannot find a proper schematic for that anywhere.
I believe its a live connection (I'll check with multi meter tomorrow) for park but when the ramp in the motor catches the switch it goes to earth - shorting the windings for a fraction of a second to stop the motor dead in the park position - does that make sense?
Thanks for spending the time to look at it for me.
Actually I think that does make sense. I couldn't work out how It could work at all as drawn. I'll have another look at your diagram tomorrow. If 31b2 plays a part then my understanding of the switch needs updating though.