My 09 Cambria chassis batteries will lose their charge after a few weeks due to parasitic draws.
I purchased a black and decker trickle charger and it comes with an accessory port adapter. ( for those of you old schoolers, the cigarette lighter adapter)
I plug the motorhome to shore power then plug the trickle charger into a 120 receptacle nearby, like the one for the TV, and insert the port accessory into the dash port .
Issue solved.
There are various trickle chargers made, I use the one shown below on my off road machines , scooters, and the like while storing even for a few weeks in the garage. The newer ones come with a plug and play adapter. Once the adapter plug is permanently attached to the battery you simply plug the charger in and you are ready to maintain that battery.Clamps come as well if you prefer that method.
