W221 S63 - Alternator/Battery Issues

Jul 11, 2017 | 11:40 AM

sinstrex

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Junior Member

Joined: Mar 2017

Posts: 31

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2009 S63 AMG

W221 S63 - Alternator/Battery Issues

Guys i really need advise.

today while driving my comand shows a message 'Start car or Comand will switch off in 3 minutes'. Awkward since i am cruising at 60MPH.

then i quickly go check the voltage on the AMG menu and to my surprise it is 11.6V. Usually while driving its between 13.7V and 14.2V.

it is the alternator but i am still researching before spending the $$$$$$.

are there any other fuses I need to check or anything else I need to check before jumping to my final conclusion - change the alternator.

Jul 11, 2017 | 08:21 PM

alx

MBWorld Fanatic!

Joined: Dec 2004

Posts: 4,268

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Whoa. Before you spring for an alternator remove battery, fully charge and load test. If battery is good then consider an alternator.

Check your accessory belt tension too.

Jul 12, 2017 | 12:27 AM

sinstrex

Thread Starter

Junior Member

Joined: Mar 2017

Posts: 31

Likes: 7

2009 S63 AMG

Thanks guys. I am still leaning towards the alternator as there is no voltage from the alternator to the battery.
will report back with results

Jan 21, 2020 | 11:08 PM

Zay

Newbie

Joined: Jan 2020

Posts: 2

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S550 4matic 2007

And? Am going through the same issue. Alternator is fine with the voltage, changes trunk batter still same problem. Ppl are saying it's the voltage regulator? Help

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