Can anyone assist I'm looking for the auxiliary battery or voltage regulator for our c220 bluetec 2015 I've checked engine compartment and boot area plus looked under passenger carpet as was told had voltage regulator in that place but I'm unable to find anything that resembles either battery or voltage regulator

 

Is there like a malfunction shown on the display in regards to it? Asking because the vehicle might not have one, not all MBs have aux batteries.

 

Was under the impression all late mercedes with start stop technology woukd have either an auxiliary battery or voltage regulator, I've had few issues with dash lights being dim then bright and error of collision prevention assist plus inoperative we replace main battery as vehicle hasn't bern used much past year

 

The auxiliary battery is a voltage regulator -- at least, that's the case on the W205 C300. But the symptoms you're describing don't have anything to do with it. I think it's exclusively for the Eco Start/Stop, which most of us would be thrilled to have disabled. Unless you're getting the auxiliary battery malfunction message on your dash, and your Eco Start/Stop is working I'd assume it's fine.

 

Hi I've had the passenger foot well carpet up and where the voltage regulator should be attached by one 8mm bolt and lug on side of the electric box there is nothing only the fixing and it's not just missing as no plug or loose wire

 

Like I said, aux batteries aren't on all MB models. If I recalled correctly, there was a forum member that was looking for an aux battery on their wagon and they couldn't find any and people were confused why as owners with sedans chimed in about the location. Then a senior forum member that works for MB confirmed the wagon E-Class does not have an aux battery in certain regions, maybe that is why you don't see one OP.

 

Hopefully someone will be able to tell if I'm looking for something that's not there on our model c220 bluetec diesel sport 2015 my local mercedes dealer isn't an option you can't get to speak to anyone in service depth, and parts department even when given registration details supplied the wrong part completely

 

 

Lovely little video but unfortunately there is only a fuse box in that location this is why I'm getting a little frustrated all the location I've been told to check and it's not there but believe all mercedes c220 of the age ours is with start /stop should have either a auxiliary battery or voltage regulator mercedes are no help as can't get past reception to speak to service dept seems it's not the done thing at mercedes thanks for trying to help seems the c220 bluetec sport is different to most other c class w205 models