Sounds about right or more than I have seen on my meter at times from 2012 F350. The alternator senses the needs of the truck battery. The charge lead to the camper is secondary. Folks who have needs for more amps from the truck often run a separate larger lead from the truck battery or similar source under the hood. There are Youtube videos that show how to do it. Otherwise solar or more solar may be a suggestion.
Operating the fridge on DC takes a load of amps for not much return.
If you have a three-way fridge, how about operating off propane? Then the amp draw in negligible.
Steve
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC
