Thanks Cobber, i might install another fan then 
I checked the plug with a multi meter and the brown / black wire is live with ignition on.
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Could be orange & black tbf. Oh well it will remain a mystery for now & doesn’t appear to be doing any harm. Thank you all for your advice & have a Merry Christmas
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My bad, the wires are actually brown / black which is live with ignition & a black earth. Did Japan spec have anything different, my headlights have rover Japan part stickers but I dont have any history for the car to confirm.
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Its a Mk1 VVC, the plug and cable don't look aftermarket and looks OEM and as aged as all the other wiring, it would be good if someone could check their cars and see if there a similar plug
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Sorry for my late reply, I’ve been away. Done quite a bit of work, changed front lower wishbones & bushes, all drop links & arb bushes, new back box, ns rear sill welded, underside under sealed & cavity wax to box sections, loads of other little jobs. I’ll get it mot’d soon & see how I get on. It’s been off the road for about 8 years but it’s a nice car & deserves to be saved.
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Well I tried it but it was the same, however whilst rooting around I found that my air temperature sensor was unplugged from the inlet manifold & someone before me shorted the plug terminals together, no idea why. Anyway I have plugged it back in & it’s running okay now.
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