no reading across any pin at all? you are measuring the resistor coil thing with the brown plug not the wires?
if you have your meter on ohms and you test the meter by touching the prob's the reading should be low ie:0-1-2
if that right
id say that the resistor was pritty fecked thats why you have no earth path from the motor
to prove wiring and the switch works and the fan in the car
link pins at the resistor end plug (wire side) with a piece of wire
link
pins 4-2 (fan should work at full speed setting)
pins 4-1(fan should work at third speed setting)
pins 4-5(fan should work at second speed setting)
pins 4-6(fan should work at first speed setting)
if you have your meter on ohms and you test the meter by touching the prob's the reading should be low ie:0-1-2
if that right
id say that the resistor was pritty fecked thats why you have no earth path from the motor
to prove wiring and the switch works and the fan in the car
link pins at the resistor end plug (wire side) with a piece of wire
link
pins 4-2 (fan should work at full speed setting)
pins 4-1(fan should work at third speed setting)
pins 4-5(fan should work at second speed setting)
pins 4-6(fan should work at first speed setting)