13 pin towing socket wiring

[macafee2]

13 pin towing socket wiring

Here is a link to the socket wiring
https://caravanchronicles.com/guides...fault-finding/

and here is a link for a habitation relay but you will need to scroll down
https://www.campingandcaravanningclu...ectrics/page7/

link to TEC 3M relay wiring, again scroll down
https://www.ebay.co.uk/itm/Self-Swit...-/141896362193

I understand that if you have Al Ko ATC you need pin 9 permanent live but if you don't have ATC, why would you want pins 9 and 10 permanent live?
If the caravan is left connected to the car and not on mains hook up, for example on a ferry, by pins 9 and 10 being permanent live you can flatten the cars battery. Newer cars and caravans but I don't know what age should have relays to prevent this but our cars are not new and I am not convinced my caravan has a habitation relay

I have just checked one of my cars, pin 9 is permanent live, charging the leisure battery. If the fridge is set to 12v, not on electric hook up and engine not running, am I right in thinking the fridge will draw power from the leisure battery and in turn the car?


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