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I have bought a new caravan and when connected to my 1996 car the caravan’s fridge does not work whilst the engine is running. What is wrong?

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I have bought a new caravan and when connected to my 1996 car the caravan’s fridge does not work whilst the engine is running. What is wrong?

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For 1999 model year caravans there was a change in the wiring and pin 7 on the 12S socket is now an earth return for pin 6 – the power supply for the fridge. Your car wiring will not have pin 7 connected. You will simply require an earth connected to pin 7. Connect this earth to a separate point on the car from that used for pin 3. Under no circumstance connect the earth on pin 7 with the earth on pin 3 as you can cause a pin to burn out.

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