One way to check, put a meter on some 12v circuit of the house....measure the voltage, then start the chassis / engine - if the voltage increases then you know the engine/alternator is charging the house batteries.
chase the house batteries positive cables and see if you have one running to an isolation relay (mine is mounted on the frame rail near the house or engine batteries (I can't remember precisely).
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Don R.
'04 Haulmark (M42386) 42', 2 slide, 10kw - Pictures
'04 F350 CrewCab Longbed 4x4, 50g aux tank & gear vendors dbl over
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