[metroschultz]

Yes.
The extra wires are for a pwm speed control unit on the donor car.
The black is ground.
The black/red should be for high speed direct and the blue was for modulated speed.
I would hook the back to a good ground and then hit each of the other wires with
bat + to see how the fan reacts.
Also you want to make sure it is spinning in the correct direction.
A DC fan will spin both ways and pull/push more air in one direction that the other.
You can then take a front mounted fan and put it on the rear but it will not be as effective.
You may not need the ultra high speed direct drive from the original operation and use the slower speed to save energy and reduce the drag on the alt. Also save the fan a little by not asking it to always spin at max rpm.