No resister near headlight. I have a two prong plug going directly into the fan. I dissconected the plug and the fan ran on high speed, When tested directly from the battery. This is a 1986 300e with single fan. I am thinking of puting a temp sencer at the thermostat inlet and haveing the fan come on from there. I can't trace the wires back from wheel well to the fuse box. No blue wire near the thermostat. Could the differance be that this is a 1990 motor in a 1986 car?