Not too long ago, the only device to charge a car battery was a dynamo. don’t panic! We do need to look back a few years though. A better understanding of what’s happening will hopefully help you fault-find if there are problems. I’ve written this to try to remove some of the mystery (or should that be misery?) out of what happens when you plug your caravan into your tow car. It is then easy to see how connecting your caravan allows the engine to charge the caravan leisure battery. To really understand whats going on, we have to understand how the tow vehicle’s battery and alternator work first. There is a lot of confusion and a lot of myths as to what actually happens when you plug your caravan into the tow vehicle and start the engine.
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