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Quote: Originally posted by Dave and Cyn on 15/5/2024

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Possibly!
Why not play safe? Hitch up but leave the electrics unplugged until the morning.
Cover the steering wheel with a towel or something to act as e reminder.

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Quote: Originally posted by Monty15 on 15/5/2024

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Think it depends on the age of the caravan AND/OR car! Believe older caravans did not isolate from car supply as well as newer ones do, but can't put dates on it! The towbar wiring has changed a number of times over the years, far more than the simple 7pin to 13 pin socket upgrade! Again, modern cars pretty much shut down ALL electrics when engine off, but not necessarily so with older ones. The fridge 'should' only be supplied from the tow bar electrics when the engine running, it's a high demand load. There is a permanent 12v supply on socket pin 9, but doesn't appear to connect to anything on my van!

I'd play safe, just unplug the towbar electrics, BUT drape a duster or something over the steering wheel to remind you to reconnect before driving off!

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Quote: Originally posted by tango55 on 15/5/2024

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All you have to do is connect up the electrics to the vehicle towing socket then drop the caravan battery box door down and take a reading of the battery voltage at the battery terminals which would normally be around 12.9 volts. Start up the vehicle engine and then take another reading which should be higher around 14 volts. Switch off the engine and remove the key and if the voltage reading returns to the first reading then it proves that the power from the car to the caravan has been isolated.

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