The center electrode has fallen out of the carb heater. When I checked the hot wire to the electrode is was not hot. Key was on. Carb heater fuse is good. I suspect the wire will not read as hot until the Thermo Switch 2 (temperature sensor) comes on at it's set temperature. My question is where do locate the Thermo Switch 2 ? The manual diagram shows it right after the heater. I just don't know where to find it in order to check it and find out if the wire is hot when the sensor is activated. I also can not find out what temps activate the sensor in order to get current to the heater. Hope this makes some sense.