BH,sent many emails again and you didn't get them?Check the post below.Does the 4 prong connector with black&Red and 3 white wires have anything to do with anything? The radiator fan comes on with the sensor connected but ONLY with the key on.We switched the 2 power (black&red) leads around from the original way.Should we switch back to the way you suggested? What part of the relay for the ig sends power to the fan with the engine off? Thanks again for all your help.