Flat van battery

It’s possibly switchable to change the charge from battery to battery. Your handbook should tell you.

Admittedly my setup is ancient by modern standards, however my MH does not charge the engine battery when on EHU, I have been using a battery tender every few weeks/ once a month to keep it top line.

I don't believe in running engines for short periods, it could do more harm than good.

My next task during lockdown is to fit a splitter charger unit that i bought a while back, which, if the instructions are accuarate will better charge the leisure battery when on the road, but will also cascade to charge the engine battery on EHU when voltage is in excess of a set value keeping the engine battery topped up.

It might be handy to know the make and model of the motorhome? It very much depends on the system as a few brands on some models don't have a facility to charge the cab battery whilst on EHU. Both the Bailey motorhomes I have had don't have an option to charge the cab battery and on both I have fitted a device called a Battery Master which pushes any excess charge from the leisure battery to the can battery.

David

My Marquis doesn't charge the cab battery either. I've got solar & ran a supply from that in addition to the habitation battery which is split 90/10%. Keeps it topped up nicely.

My Auto trail Tribute you have to select from leisure to vehicle battery on the control panel when on hook up at home, one reason l am having a solar fitted next month hopefully, if allowed by the lockdown 

Whilst it seems strange that the EHU sometimes doesn’t charge both batteries I guess that they figure that there is no drain on the cab battery when stationary. Although all batteries self discharge a new one would probably last several months before needing top-up, unless of course you have an alarm or tracker in which case it is probably wired to the cab battery.

My Ducato camper went flat just after the lockdown commenced due to

a) not having been used for some time and 

b) having the alarms etcetera live 24 / 7 .

After the gentle ministrations of  Green Flag kicking it back to life I have

c) only locked it with the key NOT the remote and

d) { probably naughtily  } done my supermarket shopping about     every 10 or so days and always gone the long way round.

Thanks everyone. Should've said the van is a 1914 Autocruise Jazz. There is a means of selecting the battery to use (i.e. draw power from) but not, as far as I can see, any means of selecting which one to charge. I just assumed that the electrical management system would know what needed charging.

 The Swift handbook is not very informative. 

A vintage MH! 🙂

Blimey RonHub, Brian is pleased there is another A/c Jazz on here --  Mine is the 2012 version on Fiat duckky !