Eojj

Purchased an autocraft battery 9 months ago from advanced auto. The battery recently died on me so I thought it was because of the cheaper brand. I brought it back to advance auto for a replacement but they wouldn't budge, saying batt was completely fine. They did a full recharge on it overnight. I plugged it in and car runs up like a champ. Next day, car dies again so I gave up and went to buy another battery (directly from Mercedes this time).

My friend who is a mechanic confirmed my alternator was okay as well. He's thinking something is draining the battery. I'm not sure where to go from here.

Known issues I have on the car:
1. Clicking noise that lasts roughly 2 mins upon starting car. Pretty sure it's a bad servo motor or cracked linkage per reading other common threads.

2. Passenger seats Headrest doesn't move

Based off these 2 things above and common issues -- it's possible the passenger power seats are drawing battery? quick start would be to unplug it. Question is how and where Lol

Here's a picture of all the plugs underneath the passenger seat:


Should I just unplug one of these? Lol

Open to any and all suggestions please!! This is driving me nuts.The car runs fine currently after a jumpstart and a long drive. I'm afraid of leaving it sitting for a day without driving

Also, I have a 2004 CLK500

CDM Motorsports

if you go through the menus on your steering wheel you can check the voltage. See where that is.
do you have a power probe or volt meter?

Plutoe

Not a simple task for the car owner, you have to get off the couch grab a volt meter and test every fues point for the drain or else do it the Ben's Wurld way which is to start guessing and pulling connectors until you found the source, FYI you car has about 80 connector points.

An alternative is find someone with SDscan and they will find the problem in five minutes!!