12V battery charging problems - no-start

[bclassboy]

I thought this may help someone in the future as it helped me.

https://www.youcanic.com/mercedes-benz-p1c0300-fault-code-malfunction/

https://youtu.be/KskiQcvHDFA

 

[anthonygaeto]

I have a 2015 B electric drive The dealer let the car sit for 3 months while ordering a part. During that time the 12 volt battery went down to Zero. when I got he car back within 2 weeks the car wouldn't start. I learned it I disconnected the battery fro 10 seconds and reconnected it it would start. I replaced the battery because its voltage was a little low, that was fine for a few days and the same thing started happening again. I believe the charging circuits were damaged by the actions of the dealer? Did anybody else have similar problems and Know what the solution is?

 

[Jaywlker]

Following to find out if there is any further information about this issue.

 

[JeffRay]

anthony,

it can be more complex that replacing a MB 12v battery. dealer may have to reset several systems which went offline. did not happen to me with my Bs but twice with my ICE MBs

 

[anthonygaeto]

Here is my current experiment, I am using a 3 amp AGM battery charger to keep the 12 volt battery charged, charging it on opposite nights of the HV battery charging nights. so far so good. I am also going to search for a bad fuse. Otherwise I believe it was likely damage by the dealer when they tried to charge the 0 voltage battery.