E-Class 12 Volt Rear Constant Power Needed
Thread Starter
Newbie
Joined: Apr 2021
Posts: 1
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E-Class Estate 2017 W213
E-Class 12 Volt Rear Constant Power Needed
I'm new to this and actually new to Mercedes. Got an estate to carry lots of kit including a 12 volt fridge. Worked great in my last car and would take 5 days to drain the battery. Trouble is power in 'switched' in all 3 12 volt sockets so goes off once the ignition is off. I've seen some threads when the fuse can be moved to change from SWITCHED to CONSTANT but none relate to the 2018 E-Class and the fuse box in the boot/trunk doesnt have this side-by-side set-upwith the fuses. Does anyone know how to keep the power on in these 12-volt supplies (especially the rear one)?
Senior Member
Joined: Jun 2018
Posts: 317
Likes: 102
From: Northern Germany and sometimes Southern Germany
Mercedes E220d AMG Line Estate (S213) and Mercedes E220d AMG Line Cabriolet (A238)
I think you will find that if you try to run this fridge for more than 10 mins the car will shut down anyway. It is very sensitive to battery voltage drop. If we do not drive either of our cars for 2 weeks then we get warnings about charging the battery. You can even make the starter battery critical by leaving the Command on for 30 mins whilst doing a satnav update....
Member
Joined: Jan 2019
Posts: 119
Likes: 28
From: Maldon
E220d
I used to have the dashboard camera connected at constant feed (inside front left hand side fuse box, MY2016 W213) and that was messing the car so much, that I had to change it to ignition feed only.
I believe that it is something like 0.5V drop and the car goes into "end of the world protection mode". Messages of critical battery state, windows would not close with one touch mode, etc.
I believe that it is something like 0.5V drop and the car goes into "end of the world protection mode". Messages of critical battery state, windows would not close with one touch mode, etc.
