AUTODATA CIRCUIT DIAGRAM HELP

[Tom]

So do i need to measure the resistance from the 0v wire on the fan to a ground and that will tell me if its the resistor thats broked? But then if the speed selection switch isnt working i wont get correct resistance readings anyway?

I was saying wire colours yes, the Red wire has a green plug i believe thats the constant 12v one.
And the Black wire i honestly cant remember what colour plug was on it, tempted to say black, but its late.

Thanks for your help so far mate, my electrical knowledge only goes so far lol.