Hi .... New to the site ... Hoping maybe to get some help on a wiring issue

Got an 04 predator 500 and when its running lights flicker like they are dimming ... Also my rad fan dont come on .. But when i hook it to 12 volts fan works .. And red light comes on ... On dash ... So im assumeing the sensor is working ... I had to reroute wires to fan to a headlight to get 12 volts to make it work for now ... Until i find out issue ... Can anyone help??? Greatly appreciated...

 

Look in your other post.. Not necessary to post twice on the same problem.