Heater Ignitor Works On 110V But Not Battery
So the heater in my 1995 Bigfoot TC is having some issues. When I plug the camper into 110V it works fine. When I switch it over to the battery the ignitor does not click but the fan does turn on. I...
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It sounds like the fan is not running fast enough on battery power. When you are plugged in to 110V the converter will be running your DC voltage at around 13.5 - 14V. The battery will only be about 12.6V on full charge. The fan needs to run fast enough to make the sail switch turn on for the ignitor to fire.
Either you have a poor connection that is dropping some voltage on the way to the furnace or there is some blockage in the furnace output side or the return air (feed) side.
Given the age of your camper a poor connerction is the first place I would look. While the fan is running on battery power, measure the voltage at the battery and at the furnace. The furnace connections will probably be hard to get to, but that is the only way to really know if you have a voltage drop. The voltage at the furnace should be no more than 0.1 to 0.2V below the battery voltage. Any more than that and you will need to check / retighten all the connections at the battery, the DC fuse block, and the furnace.
You should also look for any air blockages in the ducting if you have that type of furnace.
Either you have a poor connection that is dropping some voltage on the way to the furnace or there is some blockage in the furnace output side or the return air (feed) side.
Given the age of your camper a poor connerction is the first place I would look. While the fan is running on battery power, measure the voltage at the battery and at the furnace. The furnace connections will probably be hard to get to, but that is the only way to really know if you have a voltage drop. The voltage at the furnace should be no more than 0.1 to 0.2V below the battery voltage. Any more than that and you will need to check / retighten all the connections at the battery, the DC fuse block, and the furnace.
You should also look for any air blockages in the ducting if you have that type of furnace.
