Hello, I wanted to share an issue I seem to be having with my camper battery not charging when it is plugged into the car. This past weekend I went on a camping trip where we did not have any electrical or water hook ups. I ran the refrigerator on propane all weekend, worked great. Weused the battery a good amount for running the water pump and the lights in the camper . I have a charge indicator on the camper battery and it said 75% when we left the campground on Sunday. I switched the camper to batterysee when I hooked it up to the car it was about an hour and 20 minute ride home so in the car off for about 10 minutes while we stop to get sandwiches for lunch. When I got home and put the camper up it took about 20 minutes from when the car was off until I got the camper put up. In the camper was off I turned on the lights inside the camper and they were very dim and the propane detector beeped consistently because it had low-voltage. Even though the camper was hooked up to the car it looks like the refrigerator drain the battery significantly, in the car did not provide constant power and/ or charge the battery. I do not believe this was an issue when we were driving to our campsite because I had had it out electricity for the past week and it was cold enough where the refrigerator did not have to turn on. Long story sure what would be the problem causing the car not to charge the battery? I bought a 7 way extension cable, so that the next time we go camping without utilities I can charge and/or run the camper off the car if we choose to. I have checked all the fuses and tested all the blades and everything seems to have power. Could it be that the refrigerator is 18 years old and just eating up power quicker than the car can charge it? The battery was at about 12% when I got home. Any comments or advice would be much appreciated as the camper work very well without utilities and the battery lasted a very long time, so we would like to do more camping at state parks.