Originally Posted by windsolar
Do you just find a 12v line and connect to battery with fuse and that keeps the battery charged? Chris
That works in theory. However, if the car battery is low when you hook up, it will draw a lot of charging current and blow the fuse. The other problem is that the car and MH circuits will be directly connected. Anticipating every possible outcome in this scenario gets complicated.
If you want to charge the car battery on the road, you will need a 12vdc-to-12vdc charger, usually mounted next to the car battery. These limit the amount of charging current drawn from the MH connection and are available from most vendors that sell trailer/RV wiring kits (e.g. Etrailer.com). Wire runs from the 12VDC source on the car's six pin connector to the charger, to the battery post. The six pin ground will also have to be connected to the car's ground.