Hi Clive
Towsure do them here
http://www.towsure.com/product.asp?p=2444
I save old cables from appliances(with 13 amp plug) and they are ideal for this job.
If you put a double adapter in say the fridge 230V socket you can use the appliance lead for the 230V supply with the protection of the fuse in the plug as well as the van trips etc and no need to cut into van wiring.
You can connect to the rear of an existing socket also.
The 12 V should be wired direct from the battery using fairly heavy cable via an in line blade fuse
I have one on the awning side and one on the off side which is fitted between the fridge vents (very easy to get at when installing)
For the cut out make a cardboard template and cover a good area of van side.
Drill a hole at each corner and join up with a pad saw.
Use mastic sealing tape and stainless steel screws preferably just long enough the reach the inner wallboard.
Hope that helps
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