In the manual they instruct you to attach the power lead from the chassis to the power to the fan, then cut the ground coming from the fan and connect it directly to the thermostat. As best I can figure this is so that when the thermostat is made at a certain temp it then provides the ground for the fan and it is switched on. First, am I correct in my thinking here and secondly is this how most have installed theirs? If so, what should be done with thermo wire & ground wire from the chassis? Does the radiator need to be grounded additionally and if so how have most done this?

Thanks