Nuevo battery charging

Why Oh why can't motorhome and caravan manufacturers provide better handbooks?  Money I suppose, but when I buy a new Jaguar or Mercedes for the same sort of money a new motorhome costs I get a phone directory-size handbook which takes a few days to read but usually tells me how the beast works. All I get with a motorhome is the briefest of guides and a wodge of appliance leaflets. Forums such as this make up the balance with members prepared to share their knowledge which I am sure most of us really appreciate. Anyway, rant aside, I have come across another query which hopefully someone will know the answer to. The control panel in our 2005 Nuevo is a basic unit with a couple of gauges and a few switches. The left hand switch is a change over between Cab and Hab with others marked "master" "battery/water" "pumps" etc. I have given up on the water option as in my experience these are not to be believed whatever they say. It still works when set to the cab option which is puzzling as there is no water there!! No matter it is the "battery" option which confuses me. I guess that when set to "Hab" with "Master" set to "on" the battery gauge indicates state of the leisure battery and when set to "Cab" shows condition of the vehicle battery. Is this even right? Given that when sited with 240v mains supply the leisure battery is being charged, does the vehicle battery receive the benefit of the on-board charger supply when the option switch is set to "cab"? I hope I have explained this sufficiently well to have explained my query which will enable a more knowledgeable member to share with me please.
Thanks in anticipation,
Barry

The master switch is exactly that, a switch which overrides the other switches . The rocker switch for the batteries is to direct the charge from the battery charger when on hook up. The battery guage only shows the state of the leisure battery irrespective of the rocker switch position.

Did you get the original handbook Barry? I have one, two actually, and I think it's quite comprehensive. 116 pages is not brief. Ok, the circuit diagram could be a little clearer, but that's getting a little technical. I've found the water gauge pretty accurate, ok it reads full for quite a long time even though some water has been drawn off, but from around about the halfway point all is good. I've watched the gauge when my wife is showering, and sure enough the pump starts to race as soon as the needle hits the bottom..

I have a similar setup on my 2002 Nuevo, battery switch always set to hab as I have a battery mate fitted where the vehicle battery gets topped up from the leisure battery. Only about £65. Although many will not agree I always have the Nuevo hooked up on the drive because of the drain from the alarm and for some reason the standby on the radio being live. Still on the original vehicle battery, but not sure now if the starting is helped by the leisure battery. Only on the second leisure battery at 3 years old. I have one you can check the levels and had not had to top up yet. If it needs a regular top up and starts to over gas I will change it. At only about £60 from Bristol batteries. I am surprised a comprehensive manual did not come with the Nuevo.

Wow, still on the original vehicle battery after 14 years?? Must be a record, I know for a fact my van is now on it's third one. I also have a batterymaster type box fitted, much cheaper on ebay. I keep the van at home but only put it on EHU prior to a trip in order to pre-cool the fridge, I leave the charger switch in the mid 'off' position, the rest of the time I leave it to the solar panel to keep the batteries topped up.

I also have solar and a battery master. I was advised to leave rocker switch on leisure battery, and let the battery master look after the engine battery.
I only put on hook up at home overnight before a trip to cool fridge.

I don't think the position of the rocker switch makes any difference when not on EHU and charging with the solar panel. My panel feeds the solar controller which in turn is connected straight to the leisure battery. The battery master just links in the vehicle battery when a pre set voltage is reached in the leisure battery.
Al.