Found this thread and was smiling about how forumers really do know these cars better than anyone so off I went under my passenger side of the console on my 2001 Ph2 Spider to get at this Clarion Connector. happy days.
Found what I wanted but it had two wires on it, a green thin one and a red fat one.
The fat red cable can only be in 2 of the 3 slots (if it is to be connected to anything, so has 3 options) 10,11,12, and as delivered connected pins 10 and 11, both red cables when tested against the loom of the car. I assumed this being a fat red wire was the same fat wire I get up at the head unit, I traced that and checked for continuity and it was the one from position 10.
Before i pulled the plug the fat red at the head unit was constant 12v, with the 'dongle' (old fashioned IT speak I guess now but thats what this is I reckon), ie the plug, removed the red wire at the head unit did not have +12v ever, ie ign on or off.
I tested the feed to the middle fat pin, ie 11 and it was a constant 12v feed.
The only other position I could connect the dongle cable was pin 12 and it would then be connected to a fat orange wire... that might of course be a good thing as when you read above that is the switched feed for the other acessories on some cars. I tested the loom connection at the plug and indeed it was powered when the ign was on, and off with it off... perfect!
So as the orange is switched 12v feed, then moving the red dongle cable connector from the center (red 11) to (orange 12) gave me the fat red wire at the head unit as a switched feed. Easy. So for me on my 2001 spider connecting pin 10 to 12 was what i needed to be connected on the dongle.
The thin green wire links pins 2 and 6... I didnt want to move those as i now had got what i wanted. For completeness I checked on the other half of the connector, ie the loom side, and there is no pin 7 on my loom... hmm...
For those that struggle with electrics I bought a cool tool recently from Sealey a PPX tester. It is superb in the spider as the battery is right there behind the user for easy connections, tho it has a long lead anyway. Whats cool is that it recognises a 12v feed with a beeping and flashing red light and continuity with green solid light. so its simple to test the switched feed by leaving the wire round the pin of the unit and switching the key, instant read that you have a switched 12v feed. supercool. I up specd and got the PPX version of the tester with LEDs on it so you can see what youre probing, dont think Marsians. LOL. But there is a cheaper version without those and the beeps. The unit also has the ability to apply +12v to where you want it for testing thinsg to prove the unit works either on the car or off, Ive not used that yet but its bound to be useful for something on this car soon. Anyway, my advice from a happy customer (who has no connection to the manufacturer) is that this thing paid for itself just on this job, I reckon its worth getting. I got mine from a seller on uk ebay, but I read on some forums that halfords and others sell em too. just my 2c.