Leisure Battery or No Leisure Battery??

It does not matter what equipment your van has the wiring is exactly the same for twin or single sockets.

The wiring system, for towing, should be identical on all cars.

You added a further complication to question that wasn't needed. And besides, I never went into what wire in what pin did what in which plug/socket.

All cars wiring is same except when your caravan is old enough to NOT have a habitation relay & then it's different. ;-)

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The older caravans without habitation relays etc will have different wiring, however all car wiring should be the same no matter the age of the car.

It may depend on the age of the van what charging voltage the van battery receives. This is the van system not the car system.

Are towing sockets being checked in the car's MOT?

Are towing sockets being checked in the car's MOT?

The 13 pin is checked for functionality of all the road lights, but not the fridge supply nor the permanent 12volt supply. But right now the car cannot fail the MOT, it will get an advisory if it fails the road light test.
7 pin electrics are not checked electrically, but the 12N socket must survive a visible integrity check.

Ok my learned forum contributors. I am just about to pick up my van after a winter layover and this is the first van I have owned with a mover attatched....So considering that I have not charged it over the winter I will give it an hour on the storage mains and then drive it for 15 mins to home ...What if in that time I have not got enough charge to efficiently work the mover..can I plug in the mains and trust the current converted,from the mains, will move the van ?. Can I cause any permanent damage to the electrics ...any one had to do this in an emergency .

Ok my learned forum contributors. I am just about to pick up my van after a winter layover and this is the first van I have owned with a mover attatched....So considering that I have not charged it over the winter I will give it an hour on the storage mains and then drive it for 15 mins to home ...What if in that time I have not got enough charge to efficiently work the mover..can I plug in the mains and trust the current converted,from the mains, will move the van ?. Can I cause any permanent damage to the electrics ...any one had to do this in an emergency .

It shouldn't do any harm to the mover. The caravan power supply will be stabilised by the battery, as long as the battery is in circuit.
But movers draw in the region of 60 amps, or even more on a slope, so the problem as I see it is that the mover takes well over the current that a caravan power supply can produce (only between 10 and 20 amps depending on model of PSU fitted). So if the battery is really low, the caravan power supply will be stressed. This should cause the power supply to shut down befoire damage is caused, but as all things are prone fail under extreme load, that is what I'd be more worried about.
Why not give the caravan battery a 15 minute charge on jump leads from the car? That will certainly charge the battery far more than using mains.

Thanx thats very useful info regards the power draw...will perhaps take it on a longer drive before trying the mover.

As it's only 15 minutes away I would collect the battery the day before and fully charge it on an intelligent charger if you have one if not, an ordinary charger, that is if you must use the mover. There are many car battery chargers around that don't achieve 14.4v.

Before I had a motor mover I used an 85ah leisure battery- when I had the mover fitted, I was advised to have a more powerful battery, so upgraded to a 110ah one. I keep the 85ah battery as a spare, so would use that if there was a problem with powering the mover from the main battery when getting home.

I understood it to be good practice to have a battery in place when using a electrical hook up to act as a buffer against powers spikes which could damage some electrics