29-10-13, 09:05 PM
(This post was last modified: 29-10-13, 09:06 PM by Motorbreath.)
As said, you need a diode tester. Also the fan and the light have different sensors, both at the thermostat housing. The smaller one for the light. On my bike the fan's one stopped working.
Unplug the wires from the sensor and make a jumper and see if the light works.
Unplug the wires from the sensor and make a jumper and see if the light works.