FYI if you have to travel in statesthat require stations to use BIO Diesel only and have to fill your tank with it. MB states that you have to change your oil more often as the BIO Diesel will dilute your oil and can cause you problems.
I've had a 2014 Pleasure Way on a Mercedes Chassis and have experienced only one problem and it was 2 wheel sensors that failed and both were replaced by Mercedes for free. I get 18 mpg as I don't push the speed limit. I drive 62 and use cruise contr...
Check the alternator voltage on both sides of the isolator, one leg charges the chassis battery and the second leg charges the coach battery. If no voltage is coming to the center post of the isolator the alternator is bad.
Have you checked the battery isolator that is between your chassis battery and your alternator to see if it is allowing voltage thru to charge your chassis battery.