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In the latest Practical Caravan

(Expert Q&A, issue 438), Dave Marshall asks if the battery is being charged when he is towing. Unfortunately, as suggested in the reply, there is no definitive answer.

Our tow cars over the past 14 years have been BMW 530D, Audi Q5, Porsche Macan S diesel and Porsche Macan S petrol. All were bought new with a factory-fitted towbar and electrics, but not one had pin 10 connected, and this is the connection that would charge the caravan battery or power the fridge.

At my request, Audi did add the connection to the Q5, using a supplementary wiring kit, but despite trying hard, Porsche was unable to source a Porsche-approved kit for the Macan. I understand it is unusual for pin 10 to be made live in German cars, but other brands might do so, so it is worth checking.

Our concern was to keep the fridge cool on long trips to the south of France, but we had learned to live with the problem by loading the fridge with frozen food. Post-brexit, the fridge will have to be empty – so I guess that problem has gone away! Peter Gardiner