Dometic RMS8551

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[Deleted User User], I have a 12v master switch on charging/fuse unit, when switched  off everything 12v (including fridge) is off, but, should I need 12v lighting I have to put master sw to on thus switching fridge on creating an awful warning beep. My problem is how to sw fridge off without turning main 12v sw off.

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There was a time when caravans had very few 12v fuses and often no key as to which served what. We removed them in turn and logged what didn't work. As a result, so we created our own key. Our later vans have all had a key showing the function of fuses shown in the handbook, or on the fuse panel itself. So you could identify the appropriate fuse by simply removing them in turn. There's a downside to turning your fridge off in this way, because individual fuses often serve more than one piece of equipment, so you will need to check what else doesn't work when the fuse is removed.