you dont say what year the van is, the cascade needs 12V to work, as well as gas, check the fuse on the 12V side, mine is on a fuse by itself. if there are no lights, I would think the 12V is suspect.
the taps may not be wired if the water is on a pressure switch, the same taps are used in both pressure and microswitched systems, but the micro switches are not wired in.
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The original Mardon caravan firm did go into liquidation in the early 90s but was bought out by some of the workers and now supplies spare parts, services and repairs etc. Might be worth giving them a ring.
------------- Tigermouse
I have a very temperamental personality - 50% temper and 50% mental