MNRon wrote:
Are the house batteries AGM and the starting batteries regular flooded lead-acid? Remember that regular batteries need to be vented. I'm not familiar with class C's but it could be that the batteries in the back are vented to outside air, while the batteries under the steps are AGM so they don't require outside venting. Just a thought.
My Class-C understep batteries are standard lead-acid, and there's a vent in the back of the battery box. There's a rubber gasket around the step to seal it off from the coach. Since most RV's still come with flooded lead acid unless you pay for an upgrade, I'd be surprised if there's no vent in both of his battery boxes.