2003 TRX650 Intercooler fan issue

So i have a 2003 Rincon 650 and the radiator fan will not kick on. i did the test with the two sensors by grounding them but it still wont turn on. the only way it runs is when its connected directly to power. i checked the connector and it seems to be fine. the fuse is also good and i tested voltage to the fan when its plugged in normallly and was getting around 300 millivolts. could this be a wire harness issue? any help would be greatly appreciated