well here is my problem. i recently purchased a 84 sunline camper which did not have a batt in it, it was made to run off the truck batt which my truck(05 f-250 5.4) wont send power unless its running so i got this brilliant idea lol i went and bought a deep cycle rv batt and i got a 7 way plug and some 12ga wire and i wired it up so when i dry camp i could just unplug the cord from the truck and plug this batt with this 7 way plug directly into the camper now i understand that this is prob not the most clever since the RV batt is completely seperated from any way of being charged but i just figured it would get me threw the weekend since this would be my first time using the camper(my first camper). anyways i wired up this lil batt and plug get up and plugged and BAM! im sending power to the lights, the water pump, and the furance fan kicked on but no power to the fridge the auto light wont come on( its a dometic 2-way that the owner replaced about 6 years ago so its fairly new model) and i dont hear the sparker in the fridge for the propane trying to light how ever when i plug it into the truck and start the truck up the fridge will work fine. so whats your thoughts everyone?