Will try that when I get home.

 

It does not make the noise when pulled toward me

 

Just got all my LED's and the clear DEPO side markers in. Had time to install the driver side on my lunch break. Will get the other side done along with pics later

 

So went on a trip yesterday and my dash went red and popped up a battery logo? Guessing the battery is bad. Sticker on battery claims it hasn't been changed in over two years, may be time for a new one. Still cranks fine, but today my COMAND went out until I turned it off and turned it back on. How do I go about changing the battery out?

 

Somebody said it's best to call Benz Roadside service and they will install it. Or there is Autozone.

 

Gotcha. Doesn't look to hard to replace, just wasn't sure if there was some odd procedure to follow when installing it

 

Your battery should be in the trunk.... hum actually on the E63 I don't remember if it is under the hood or the trunk. Either way locate it and replace it with an equivalent. I would recommend OEM. But I guess any good aftermarket would do. A good battery should last close to 5 years depending on the car usage. GL

 

There is an Aux battery in the trunk I believe, along with the main one under the hood

 

Ok I believe now the Aux battery is under the driver dash. I put a volt meter on the battery. When cold, 11.8. After running for a while, 14.8.

 

advanced auto parts has the battery for 152 dollars after core charge with promo code online good until feb 27th. 3 year replacement guarantee.

 

Certainly the best choice if going with oem.

 

So. Main battery was tested, and alternator tested. Alt putting out a solid 14.7. Battery, around 12.4. There is a 60AMP drain somewhere in the system. Aux battery has never been replaced.... could it possibly be draining the rest of the system?

 

It could be. What is the voltage of the AUX battery disconnected from the car?

 

I call bs. The alternator is not charging correctly. Command doesn't shut off while driving if the charging system is working

 

could it be possible something is draining it so quickly that the alternator cant keep it charged?

 

Anything is possible but this car has 180 amp alternator. Who tested it and how do you know there is a 60 amp drain?

 

a local parts house that my nearest (100 miles) MB dealer recommended since they use a similar device.

what should the amp be on the aux battery?

 

You mean voltage? The batteries should both be at 12.6 volts. At least 12.4 volts.

 

yeah, my bad

such a strange problem, hard to diagnose too. glad that i have another vehicle to drive.... just sucks i've barely had the damn thing a month and this happens.

So overview of what has happened

-2 nights ago, red battery indicator on dash. No loss of features. No problems starting
-Yesterday morning, cranked fine, drove ten minutes or so, then the COMAND went out.
-Last night, tested voltage with car sitting since that morning. when i first touched the multimeter to it, it came up 11.6, and slowly rised to 12.4 or so. Cranked the car, and it started no problem, with 14.7. But after a few minutes, it dropped to 11.8. Slightly charged the battery this morning and it cranked right up. Battery indicator still on, but COMAND did not go out this time

 

Have you had the battery tested? Is the battery that is in your E63 an agm battery? It should be an agm. If you do find that you need a battery make sue you purchase an AGM battery.

 

From the manual. The battery light means it is not charging. You have a charging system problem. Your batteries May be bad as well. But that would not cause these symtoms.

 

Ok, so I charged the battery up and went riding around after accessing the service menu, or whatever it's called. Before starting the vehicle, I was at 11.8v. Went riding and here the video. It's strange, seems to stick in the 12's when in the throttle and bump up to 14.8 when coasting, occasionally sitting in between. When I pulled up at home, it sat around 12.5 for a while, then gradually dropped to 12, then 11.8 again

 

I'll try and access that menu if I can figure out which menu it is.

 

I think you have a bad battery. Mine is 13v 2 to 3 amps pretty consistently. It's trying pretty hard to charge the battery.

 

Yeah according to my menu, whenever I turn the car off it drops to 12.4, then gradually works its way down to around 11.7 or so.

I'm going to get a new OEM battery and see what happens... Fingers crossed. I appreciate you checking yours out and seeing how a normal one should act