[Frutza]

You need to see what's charging, use a voltmeter while unplugged engine off and Everything else off. Check your battery voltage then plug in and turn your Xantrex charger on and see if voltage starts to come up.
And they may have missed a wire or hooked something up wrong, by removing Leads one at a time you can id what's coach, genny and inverter and label them.
A B.I.R.D will allow chassis and coach to charge together