Batteries not charging?

Batteries are not charging when being towed or when on shore power. Have 2 6v golf carts. Entertainment system is not drawing power. Jensen radio DVD player. Not concerned about that,just a fact. Refer works on all 3 power sources.
I'm thinking its the inverter. How do I test or replace?

On the road. Current location Ogden Utah, headed south to St George. Any place to pick one up? Or get it repaired?

Thanks in advance for any help or suggestion's.

You may have a bad converter/charger.  There are several threads on the topic.  Check them out for some helpful information.  Also check the two reverse current fuses in your power panel.  They are off by themselves to the left over by the AC breakers.  WFCO has a diagnostic check list that is very helpful in determining whether your converter/charger is bad.  You can find replacements on Amazon and they're pretty easy to install yourself, if you understand the basics of a 12v system.  People have arguments about whether one brand is better than another.  The thing you want to make sure about is that the new one will fit the power distribution box.

When towing the source for charge is the TV. On shore power source for charge is the converter. So both charge sources are not working? I think I would look at batteries. One of the reasons I am not a 2-6V battery fan, one battery fails you're SOL. However the fridge can't work on 1 6V battery. Most RV places with a service department could help you, not to many sources for on the road converter repair/replace other than RV places.

Blew 2 40 amp fuses. Not sure why. Discovered that I don't have any extra.
Have to admit that I'm new to rv'ing.
We have a 2016 180 which we love. This is our first long distance road trip.
Thanks everyone for the quick responses and suggestions.

Waterman,

ALSO, the fact you said TV is not charging - you may want to look at tow vehicle charge fuse in your TV, it is probably 40A also. Mine is in the under hood fusebox on both my tow vehicles.