Any RV/Camper techs here?

[Colorado Osprey]

Yes, I work in the trailer industry and work on campers and living quarters, etc.

One problem though, when I'm plugged into 110AC everything works but when I'm running on the battery the furnace won't work.

Do you have a meter? Is it getting power at the furnace in DC?
Is the fuse blown going to the furnace?

The blower motor is a DC motor so I know it's drawing power from the battery, even when I'm plugged into 110AC.

Not necessarily. In fact it shouldn't be. It should be running off the AC/DC converter.
Sounds like a bad fuse or connection in/from the converter.

So when I switch my converter to "battery" and turn the furnace on, the blower motor kicks on but not at full power and struggles then the furnace won't light.

You really need to check your connections and ground including at the battery and fuse panel as well as at the furnace. The furnace can not light for a few reasons. It needs DC power of at least 12v for the furnace to light even on AC setting. If the motor isn't running at full power, it is probably not getting full power.(check connections and voltage) If the thermocouple is bad it will keep it from lighting as well.

And yes it's a new fully charged battery so I'm lost with why the furnace won't run on the battery? I went to Camping World but they want $100 just to diagnose the problem. So if anyone here can think of what's going on or knows how to fix it....I'd buy you a steak dinner!!!

Try the above, it you still can't figure it our PM me.

Camping World is a business whose whole purpose is to make money. Their average mark up on parts is about 30% over MSRP. Then if you become a member you can get parts there for MSRP. There are better choices.

[opie011]

PM sent Osprey