I have just checked. I turned my fridge on and to battery, it started working.
I went to the garage and turned off the 240v supply to the caravans charger.
The fridge was still working on 12v meaning it must be getting its 12v from the leisure battery.
If pin 9 is permanent live as this is the pin that charges the leisure battery I will indeed get a flat battery on the car.
macafee2
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