Camper Battery doesnt charge while going down the road

srschang wrote:
You're not going to get much charging through the factory 7 pin plug. The wire from the alternator to the 7 pin plug is too small.

Right -- need a dedicated high capacity wire from an engine charge point to the camper battery(s), protected with fuses, and solenoid (or equiv) activated.
My simple circuit .

You're not going to get much charging through the factory 7 pin plug. The wire from the alternator to the 7 pin plug is too small.

1. Have you Confirmed it's not charging at all? (IE Have you checked that you have 12V at the trailer plug?) Dodges don't need an extra fuse.
2. Confirm that current is getting to the battery?

-There is a high likelihood that it IS charging, but your vehicle 12V hot pin is not capable of carrying high amps.
- When your battery gets low, the fridge shuts off, whether on LP or DC.
How quickly depends on which mode you're running. LP only draws a few amps, DC mode = maybe 4hours out of 1 fully charged typ 12V battery, tops.

It may be best to add a dc to DC charger.

ok i had no clue about that i will take a look.

thank you

Can't offer about your Dodge, but on my GM I had to put a fuse in to a spot where there was a blank filler pin in order to get +12V at my 7 pin.

Perhaps yours has the same thing. Mines a 2007