[abachman3]

The outer housing should be pressed in slightly and turned to the right and have a noticeable stopping point where it sort of clicks into an open position and the bulb will stay lighted. The bulb does create a lot of heat and the outer case becomes quite hot, making it difficult to turn off.... perhaps why it is not meant to be on all the time, just intermittent. press it in somewhat and look at the speed and/or gas gauge and let it return to the off position.