I have a 2010 heartland sundance. We are having the typical dimming of the lights and what not. Last night all the lights went dim and the LPG detector went off. I checked the 12v battery and it was only at 11 volts with the camper plugged in. I disconnected the battery and everything in the trailer shut down. I now have a battery charger hooked up and everything seems fine. The battery is brand new and all this is while plugged into shore power. What is confusing to me is losing all power when disconnecting the the battery. Shouldn't the converter run the lights while the battery is disconnected? Thanks for your help in advance.