Thank you, no tow car is the same, it’s just the service people said when the van was serviced that the 12v fridge wasn’t working. I’ve not yet tried it when connected to the car. All the other electrics work fine through the tow bar.
I find it hard to justify the dealer quoting you £70 to investigate.
With the right standard workshop gear and a well informed technician it would take about 2mins to establish if the fridge does not work in the 12V aux wiring. And 5 mins to follow the wiring to the vicinity of the fridge checking for problem connections.
In my opinion based on the comparative simplicity of the fridges 12V circuitry the charge a charge of £20 would be more realistic, and it should be refundable if the fridge or the caravan wiring is found to be at faulty caused by manufacturing.
Assuming the wiring is correct and the fridge does not work, the fault lies with the installation of the fridge or the fridge itself, both of which are manufacturing errors and should be dealt with under either manufacturers warranty or the your statutory rights established by the Consumer Rights Act 2015 by the retailer.
You will probably find the caravan manufacturer defers a warranty claim on the fridge to the Fridge manufacturer.