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On the 12 s plug thats on your caravan ( Grey plug) open it up and link Pin 7 ( Black) to Pin 5 ( Brown) then earth the brown wire in the boot of your car.....this now gives you 2 earth wires to share the load..............Also, as pin 2 is now unused (though still probably connected to the split charge relay) the same can be done with the feed wire by linking pin 6 (Red) to pin 2.( Blue)......................................
The advantages are obvious. The combination of 2 cores is far better than 1 and the load (feed and return) is shared by 4 pins instead of two. There will be less voltage drop, less resistance and less heat build up. It is a relatively simple DIY alteration and is inexpensive......Plus your fridge will work while you are towing with no fear of pin 7 burn out!
I would recommend using 28/0.30 (17.5 amp) cable for the linking wires.
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Topic: caravan socket wiring??
