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Not sure how your Dandy electrics are connected, but on caravans you can run your 12v stuff off the car battery by plugging in the 12S, and setting the switch in the van to the "car" position.

Maybe you could arrange something similar.

I think you would have to make up something yourself, I'm sure it could be done using the 12S on the car with the normal 12S plug, taking the power into the Dandy to a simple fuse and switch set up, and some connector where you could connect up the pump and lights.

  If my OH was here he could suggest something, but he is in Azerbaijan right now. I will ask him when he gets back on sunday if you don't get any other replies.

Would it not be better to just use a single extension cable from your 12S socket, and split the two items off to their respective needs at the camper?  You could then fit each circuit with its independent fuse.

Bertie.

That is the type of thing I had in mind too.

Two points:

(a) The amount of lights used in a Dandy, plus the water pump, are not likely to exceed the power demands for the obligatory lights, which are often in use when the engine isn't running.  The main concern is that of a long period of battery drain, and without the car being used before the drain becomes critical.

(b) I would be cautious about using a cigarette lighter socket.  The fuse demands for this can be quite low, and that part of the cable loom will not have the carrying capacity (amperage) that will have been provided by the towing sockets of the car.

Bertie.