Battery or Alternator Issue?
Member
Joined: Oct 2017
Posts: 88
Likes: 10
C63S Coupe
Hi BLKROKT, sorry to bump this thread but my car also has the 909 alternator management option and I'm experiecing a low voltage issue when car is left overnight which is causing the systems to trip (ABS and power steering go). I want to see if unplugging the battery sensor might solve my issue..
do you still have yours unplugged and have you noticed any adverse effects?
Where is the battery sensor located and do I need to take any precautions or just pull it out when car is off?
do you still have yours unplugged and have you noticed any adverse effects?
Where is the battery sensor located and do I need to take any precautions or just pull it out when car is off?
Senior Member
Joined: Jun 2020
Posts: 433
Likes: 583
From: Texas
3.0L Whipple E63 AMG
Hi BLKROKT, sorry to bump this thread but my car also has the 909 alternator management option and I'm experiecing a low voltage issue when car is left overnight which is causing the systems to trip (ABS and power steering go). I want to see if unplugging the battery sensor might solve my issue..
do you still have yours unplugged and have you noticed any adverse effects?
Where is the battery sensor located and do I need to take any precautions or just pull it out when car is off?
do you still have yours unplugged and have you noticed any adverse effects?
Where is the battery sensor located and do I need to take any precautions or just pull it out when car is off?
If you're running a stock battery I'd leave it plugged in. Unless you want to unplug it for testing purposes it's located in the negative battery terminal. Just unplug the small sensor connector.
Member
Joined: Oct 2017
Posts: 88
Likes: 10
C63S Coupe
Only unplug the IBS sensor if you've replaced the stock battery with a Lithium-ion battery. It fixes an issue when the alternator wont charge Lithium-ion batteries when the engine is running.
If you're running a stock battery I'd leave it plugged in. Unless you want to unplug it for testing purposes it's located in the negative battery terminal. Just unplug the small sensor connector.
If you're running a stock battery I'd leave it plugged in. Unless you want to unplug it for testing purposes it's located in the negative battery terminal. Just unplug the small sensor connector.
Thanks. I'm using a Varta G14 AGM battery, which I think is similar to the stock battery
