Understanding the Leisure Battery Charging Circuit Understanding the Leisure Battery Charging Circuit There is a lot of confusion and a lot of myths as to what actually happens when you plug your caravan into the tow vehicle and start the engine. To really understand whats going on, we have to understand how the tow vehicle’s battery and alternator work first. Practical Caravan: Smart relays/ 12S wiring (1/2) Smart relays/ 12S wiring 11 years 5 months ago #179035. rosies; socket , one voltage controlled ( 13v+ ) to fridge via the 12s socket , and one again voltage controlled ( 13v+ ) to charge the caravan battery in your caravan via the 12s socket . In fact I have 3 split charge relays in my toolbox and I am about to use one on my good Wiring Diagram for 12S Plug - Towing and Trailers Ltd It is recommended that a split-charge relay should be wired into your Ã¢â‚¬ËœSÃ¢â‚¬â„¢ type caravan wiring At a set voltage this relay will divert some of the power that usually charges your vehicles battery to the auxiliary systems in your caravan This is useful for charging auxiliary batteries and powering appliances like[PDF] Instillation guide for a 12v Voltage Sense Split Charge Instillation guide for a 12v Voltage Sense Split Charge Relay System Thank you for purchasing this kit from Simply Split Charge. Have a look at the diagram above to see the basic wiring diagram of your voltage sensed split charge kit. I have left boxes on the diagram on 30Amp S Type 12v TEC3M Self Switching Dual Charge Relay 30Amp S Type 12v TEC3M Self Switching Dual Charge Relay . Our Part No. ETR06 Manufacturers Part No. TEC3M. This relay will convert a 12v supply to supply a 12S (‘S’ Type) socket. Easy to wire as pin numbers are marked on the unit How to Wire up your Camper - Campervan Motorhome Caravan How to Wire up your Campervan. Below is a diagram that shows a typical installation of a 240V Panel. I have used this as an example as it is the most difficult one do, Anything smaller or with less switches just gets easier. 12V Panel Wiring Kit. Heavy Duty Split Charge Kit with 12V M-Power 140amp Voltage Sense Relay + 110amp 16mm2 Cable Self-switching Smart Split Charge Relay For Towbar Straightforward to fit, the Smart Split-Charge relay provides power to the caravan's 12 volt supply, battery charging and refrigerator, via a towbar's 12S or 13-pin socket (socket not included). Recommended over the old-fashioned split charge relay on How to wire a split relay charger - YouTube Aug 13, 2013A brief description on how to wire a split relay charger to keep your leisure battery topped up for for window cleaning Don't forget to join the No1 facebook..