is there something wrong with my alternator or just electrical?
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Junior Member
Joined: Jun 2022
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amg c63s
is there something wrong with my alternator or just electrical?
so around like 9 months or so ago i tried fixing my ac / heater because none of it would turn on so i decided to unplug my battery and plug it back in. ever since then my battery light the stop engine leave vehicle running light it’s been like this for a while at this point it turns on when it wants but then turns off randomly. it hasn’t effected my car at all that’s why i haven’t took it in but it’s just been annoying at this point. my car had no problems starting i haven’t got stranded (yet lol) but yeah my car hasn’t gave me any problems at all i think i messed something up when i went to plug my battery back i’m not sure lol
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Joined: Sep 2016
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From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
so around like 9 months or so ago i tried fixing my ac / heater because none of it would turn on so i decided to unplug my battery and plug it back in. ever since then my battery light the stop engine leave vehicle running light it’s been like this for a while at this point it turns on when it wants but then turns off randomly. it hasn’t effected my car at all that’s why i haven’t took it in but it’s just been annoying at this point. my car had no problems starting i haven’t got stranded (yet lol) but yeah my car hasn’t gave me any problems at all i think i messed something up when i went to plug my battery back i’m not sure lol
Get it sorted out man don't be cheap haha
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Joined: Jan 2022
Posts: 159
Likes: 42
From: San Diego,CA
2021 AMG C63S, 2008 C300
so around like 9 months or so ago i tried fixing my ac / heater because none of it would turn on so i decided to unplug my battery and plug it back in. ever since then my battery light the stop engine leave vehicle running light it’s been like this for a while at this point it turns on when it wants but then turns off randomly. it hasn’t effected my car at all that’s why i haven’t took it in but it’s just been annoying at this point. my car had no problems starting i haven’t got stranded (yet lol) but yeah my car hasn’t gave me any problems at all i think i messed something up when i went to plug my battery back i’m not sure lol
monitors the battery state of health, current output, and it’s ability to hold a charge, all from the “intelligent” battery sensor on our trunk starter battery. Battery state of health is monitored AT ALL TIMES, that’s what keeps your fancy app updated and tells you your battery health. Since you disconnected the starter battery there was still auxiliary battery power from the secondary battery. This triggered a voltage drop event and caused a malfunction. I would start by using a factory level scan tool like the Autel scanners or Xentry if you have it and perform a “Battery Monitoring Reset” or BMS reset. Hope this helps!
