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we have a 2003 bailey 500/5 with the same set up.the switch next to the door for the lights is left on full time.the 12 volt switch controls all the 12 volt services not just the lights.ie.pump / 12v tv / lights / gas water heater ignition ect.if not on EHU the battery can go flat from full in no time.if battery is full without EHU connected you can look at the meter and it will show 12.7 volts.when EHU is connected you see the meter go from 12.7 volts  to 13.5 / 14 volts.a good indication because you know the charger is working as it should.