Wanted: Fan switches

[Niall]

brown should go from infinite resistance to no resistance iirc
as its a switch and hence goes off, then on.

i may be chatting shit, in which case, ignore me!

Nope it won't. It will have a top resistance and the control unit will turn the fans on at a certain resistance. The only reason they come on when you unplug it is as a fail safe to protect your engine should something go wrong.