Originally Posted by Mahlstedtd
Ok. 1 12v battery will not stay charged long enough for the fridge to run for more than a couple of hrs. And a lesson on charging system. The charging system on today's vehicle will shut down while driving down the road for better fuel economy. if it sees the vehicle battery low it will start charging. It does not look at the RV batteries. Ask any new technician and he will explain it. This is why you have to have more than 1 12v battery.
Not sure where you learned this lesson. We are not talking about a Prius here. We are talking about trucks. My fridge has operated, while towing for over 10 hrs on one 12v battery being charged by my Ford SD alternator.
If your learning this stuff from CW, you might want to run away from there and as fast as you can. I'm just saying you have another issue that your battery is not charging while being towed. You may never resolve it because once you get enough batteries installed it will probably get you from point A to B until you reconnect to shore power... Good luck...