Darren Ridley

Hi All, I'm trying to hard wire a dash cam in to my 2018 W205 C Class estate. I have run everything to the fuse box on the side of the dash however I have alot of blank spaces. I intended to use fuse 212 (as of 01.06.2016: Antenna changeover switch for telephone and stationary heated 5amp) but the cam never switches off. Can anyone shed some light on this for me please ??

khomer2

Not familiar with your model, however, electrically speaking, if power never switches off then your power source you tapped into is always hot. You need to tap into an accessory line that comes on or goes off when ignition is initiated.
Such as the radio or the accessory plug (possibly as some accessory are always on (ie. not switched)

Darren Ridley

khomer2

That seems to be only one fuse box. Where is the other?
Have you used a light tester to see which ones are on accessory and what they are accessory for?
You need to test them.