Caravan Splitter Relay

Evenin all

Just bought me a caravan for off roading weekends Needs a bit of work

Anyway, done a bunch of searching but cant find answer to what kit I should use to add a 12S lead to the Defender to charge the leisure battery on the caravan.

Seems to be a few different types of splitters about and not sure what is best set up.

Any advice welcome

wot like this?

Landrover Caravan Trial | 4x4 | Off Road - YouTube

Depending which defender you have lots of kits on eBay etc. which are fitted without splicing wires, soldering connections and so on. I replaced 12n electrics with 13 pin in a couple of hours using Land Rover genuine harness to suit new caravan - and I am no electrician.

I just used a voltage sensing relay, one wire from battery, easy peasy.
think mine came as a kit form towsure.

OK cheers. Just ordered a kit from Towsure.

The wiring for relay this doesn't look to complicated.

Towbar Split Charge Relay Wiring Kit - Self Switching Towing Relays Wiring Components and Accessories Towing Electrics Towing

Mate of mine got me to call his vehicle sparky, who said not need to run from the battery and battery box, there is a spare connector under the tub by the offside rear wheel. He would take all necessary connections for the 12s from there.

Anyone know about this? I do remember seeing a small socket a while ago. Tucked it out the way and its too wet to go look now.

Can find anyone else talking about wiring into this for the 12S

I ran a 4m grey 7 core from the socket of my 110 down the chassis into the battery box.

I originally purchased a kit which had a heavy duty relay and got them to increase the length of the 7 core for me.

The only downside was you need to ensure the relay supplying the charge and fridge supplies is only active when the engine is running. As I did not want to tap into the TD5 loom I finally added a voltage sensing relay that drives the main relay. Complicated.

Ironically I have just found this thread as I am now trying to find a decent supplier to rewire the Mrs 300 Disco. I am looking for a 12n loom with the plug on (When I had my previous Disco this only cost £7) anyone know the part number?

I will also probably fit a 12s too so it can tow the caravan and charge the battery / run fridge in transit.

Basically do NOT trust your autoelectrician about clipping into the wiring loom for the 12s power supply. You need a fused supply that is only live when the engine is running (14v+) from the battery using a heavy duty cable, the reason being that the voltage/current loss from Battery to battery in a caravan is quite significant when you realise that it is traveling 8m through fairly small gauge wire. You may end up with virtually no charging even on a long run.