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You need to buy one really, unless you're a pretty competent electrician. Lots of people seem to sell them; have a flick through LRO, or google around. I found this thread which might be of interest.I presume you're thinking of the fridge? It's a nice solution to the problem, but it will probably work out quite expensive.
Personally if you are not running a winch, fridge or large ICE I'd fit a larger alternator (90-120amp) & have done with it. Fitting a second battery wont help in the long run as you are still taking out a large current & then trying to top up two batteries with the same alternator. Net result is you'll have two dead batteries!As the roof lights & working lights are on a small percentage of your driving time it seems an awful big expense & hassle fitting twin batteries when a larger alternator should do everything you require