Thank you very much folks - I did find it in the FSM in the end.

Here's a link to the wiring diagrams

http://www.startekinfo.com/StarTek/outside/11832/Resources/201Create/PDF/01002.pdf

And here's a screen shot showing the diagram



It is called the "defogger" in the FSM

Attached Thumbnails

 

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!