ELITE_KOV

I was driving into work this morning and the usual "low battery conv. features temp unavailable". now this usually happens in the winter months after a cold morning start, then goes away after a few mins of driving. But today was different. It came on while I was driving and stayed on until I parked.

I replaced my main battery with OEM about a month ago so it's brand new.

I just don't want the car to die and leave me stranded on my drive home. I am not sure whether the aux batt, alternator, BCM etc. have ever been changed.

I didn't have time to check the terminal (maybe they/one of them came loose), so maybe it's something that minor.


Any ideas? Will the car literally die or is it a possibility? Voltage should be fine as the main battery is brand new and I drive it almost every day so it's not like it sits for weeks on end.

TIA

ArmoE55

I'd check the terminals first. On my older 06 I had, I didn't attach the positive terminal down well enough and after a few spirited drives, it was nearly completely loose and caused those warnings. Start there.

I don't think it can be the alternator because you'd get a 'low voltage' message or something of the sort. And I believe when the alternator or regulator are going bad, they put out a bad burning smell that can't be missed, so be sure to see if you smell anything.

If you live in a colder climate area, sometimes these cars go nuts when it's cold. For instance, in Maryland, it was over 70F yesterday and today it is low 40s. That, in and of itself, can cause battery problems like you're describing.


Someone one else will chime in hopefully, but I don't think what you're saying would leave you stranded. Also, when red warning signs come up, that's when you need to start worrying.

shardul

iTrader: (1)

you can drive. Rule of thumb if the red warning light comes on then you are in trouble and could be stranded.

typhoon43

1. Turn your key to position 1
2. Briefly press the Reset button on the dash button 3 times
3. You should have the current voltage shown

Ignition off you want 12.3 or higher on a good day
Ignition on (idle) you want to see close to 14 volts.

If it's Fluctuating big time, it could be the voltage regulator on the back of the alternator
If it's just not climbing above 12ish no matter what, you may have a dead/dying alternator.

I did the voltage reg on mine and it fixed all of my issues. Much cheaper than an alternator so I'd at least do that before replacing the whole thing (IF that's the case).

You can also have your rear battery load tested at any auto shop for free.

GOOD LUCK! I'VE BEEN THERE!

Yacht Master

Those warnings in the MFD are Mercedes Benz just messing with you, keep driving.

novae500

Did you change your aux battery? If not, then may need to do so.

eljefe7070

I found that after driving awhile and getting the battery to a good charge, the light will go off. My issue was that my AGW was draining my battery. I have not gotten that indication since I removed it. I have not replaced the main or the back battery yet.

BI-Performance

Stop by autozone or any auto store and pick up a trickle charger for $40. Charge the front and then the rear over night and you should be fine.

moosejaw

I have two trcikle chargers going at the same time.
I ordered a new aux battery for $46 from a link Toadster provided.
Lets hope thats it.

AMG E Power

Could be the alternator. When mine went their was a burnt plastic smell from under the hood and the next day as I'm pulling into Mercedes to see what it was I got there and I got the convenience controls unavailable or whatever it says and it was my alternator. No red ring of death or low voltage at least with my car. Hope u get it fix

Hotrod-Realtor

Here is my story.
https://mbworld.org/forums/w211-amg/...xed-cheap.html

ELITE_KOV

THIS WAS IT!! The terminal came a bit loose and I guess with the colder weather it didn't help but drain it. I tightened it up a bit after work and the message never came. It's crazy how something so trivial and little can cause a world of problems and worries that something serious might happen.

Checked my volts on off switch and car on, all volts were good readings.


Thanks for all the tips fellas!