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I am making / installing an automatic on-board water tank filling system to my 2009 Bailey Senator Arizona. I made one of these for my Lunar Delta about 20 years ago. Now I have another Caravan with an onboard tank I find it annoying how complicated Bailey have made it to fill the on-board tank. I have to remove the cushions from the rear locker, lift the rack, "set" two change-over valves, (correct combination, depending if I am using external, internal or filling internal from external). Then switch the electric pump to "fill", wait until it's filled, and then switch the valves as required for "operation". I looked on the market – there is NOTHING, nothing on Ebay, Nothing on “The Web”, nothing on YouTube, nothing in the Forums on how to do this… No gadgets, no advice, no discussion – maybe I’m the only one that wants this ???? I have added an Carver / Truma Crystal filter inlet into the side of the caravan directly next to the on-board tank. I will use my old Truma external pump to fit this fitting. This will fill the tank directly. I am fitting a relay (in a small plastic box to be neat) along with an "audible" alarm to warn me the external pump is operating. As my tank already has a "low level" sensor and a "high level sensor" (to stop the on-board [in fill mode] pump when full) it will be an easy job to do. I am fitting 2 switches - 1) Off/Fill to High Level 2) Fill to low level only (reserve level). If anyone is interested, I am going to document this fully with Photos on my Blog as it will be too detailed (and the photos) for here: https://tony-sparks.co.uk/blog/2019/09/13/automatic-on-board-water-tank-fill-system-tracker/ You will need to cut a hole in the side of your van to fit a Truma (or pump interface of your choice). You will need to be "capable" with 12v Electrics, and able to wire a 12v relay and a couple of switches. I *may* consider making the "control" boxes when I have finished mine - if there is any demand- but I may not! BTW: While you are about it (Bailey Senator Only) - I will tell you how to change the "ancient" battery on your (Secret Location) Tracker / Alarm system (mine was 10 years old and bulging - and was down to 2.2v!). Replacement battery - £14.50 delivered from Ebay! Any Comments ?