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Towing and Caravan Topics A forum for all towing/caravanning related topics

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Leisure battery charging via tow socket

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Old May 25th, 2020, 10:22   #1
reggit
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Last Online: Today 08:25
Join Date: Feb 2012
Location: Preston
Default Leisure battery charging via tow socket

Hi all,

I’ve recently installed a 12v battery in my trailer tent to power lights, USB sockets etc. The electrics I’ve added are physically disconnected from the battery once the trailer is in configuration for towing.

If I connect the leisure battery to pin 9 and 11 of a 13 pin trailer socket appropriately, will the car electrics look after the charging current or do I need something in line (DC - DC charger) to charge the battery correctly?

I’m aware caravans have a habilitation relay, I don’t really need this as the loads in the trailer will be physically disconnected, but if it’s a legality will fit one.

I’m likely to be changing the car soon (possibly) from a EU3 engine to a EU5 V70 if this makes any difference (possible smart alternator?)

Thanks
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2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles
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