As long as I'm driving it daily, there's no issue but if I store it without disconnecting the battery for any length of time, there is a slow draw somewhere. There's nothing left on in the interior that I can visually see. Just got it last August and it went into storage in October. There are trunk lights that were not working this morning. Any ideas? Also, I'm trying to schedule an appointment to get it in. The Chrysler dealer won't touch it, which I wasn't surprised but called to inquire anyway. Off to Mercedes, I guess.

 

It is probably the batteries in the alarm siren, they go bad and short out the circuit board. It is an easy fix. You can just unplug it or replace it. It is located under the cowl in front of the windshield. Just use the search feature at the top of the page for alarm siren.

 

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NEVER, EVER, TAKE THE CAR to a STEALERSHIP.. Also, Mercedes Benz doesn't want to touch it either. Take it to an independent European mechanic if you cannot DIY. Good luck!


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Go to the Mercedes dealer, they need a good laugh these days of Covid as much as anyone else.
There are articles on this forum telling you how to find the source of the battery drain, pizzaguy did a good one. The alarm is not the only thing capable of causing the drain. If you are going to take the car to a garage for every little thing you are going to spend a fortune.
First thing, is the battery any good?

 

Thanks, We'll try that

 

The battery started the car every time as long as I disconnected it if I was going to let it set for any period of time. We are going to try to pull the alarm and see. I also printed a PDF that Pizzaguy has showing how to find excessive standby current. We will go from there. I wasn't planning on running it to a garage for every little thing, I just was curious of anyone would have the capability to service it if needed.

 

Most 'techs' at any garage know no more about how to find unwanted current drain as you do.

You are better off learning how to find the problem yourself than trying to find someone to do it for you. The ONLY way to KNOW what is going on, is to MEASURE the current flowing.
You can yank the alarm, remove light bulbs, etc., all you want to - mostly, it's a waste of time. Keep in mind that battery will tolerate being drawn down to near zero volts only a few times before it is ineffective at filtering the DC supply of the car. Get this fixed or keep pulling the battery cable until you do!