What do you mean?
That maybe someone has switched the two wires connected on the two "bolts"? If that's what you mean, it`s not impossible! Not at all!
Do know what is the second "bolt" used for?
The first one is the Coolant temperature sensor.
The other? Is this the thermometer sensor, maybe?
The temperture switch for the fan and the sensor for your teperturemeter are usualy quit close to eachother. I don't know if it's possible, but if both wires are switched (teperture switch on the temperture meter and the sensor on your radiator fan), it would explain why both are not working.