Hi all ,don’t know if this will help others ,I have a 2013 x250 and I struggled to find switch live for power to dash cam, found a over head consul wire loom on eBay £28 all you have to do is drop interior light consul down unplug loom and fit bridging loom in and you have power switch and permanent ,and earth ready to connect dash cam hardwire kit to its a 10 min job,loose excess wiring behind headlining fit cam ,job done , easy to remove kit as it’s just plug and play no wiring cut on car etc ,thanks Dan