I have a Catalina 25 with inboard diesel. I have not been able to get the steaming light to come on. There is not a switch on the electrical switch panel. A friend though it should come on when the engine is running but I have not been able to verify that. The bulb is good and the wiring to the step is good-just no power. I will have the mast down again mid august to work on the deck light which stopped working last week. Anyone know where the power to the steaming light should come from?