make sure the plug on the back of the switch is completely plugged in. If it is then try taking the plug off and make sure the terminals are clean and making good contact with one another. IF that doesn't help then you can take the shroud off and find the wire that runs to the coil. Follow it from the coil to the switch to make sure it's not burnt, cut or loose anywhere. If none of the helps. Well, Its probably time to buy a new switch.