C63 AMG (W204) 2008 - 2015
Sponsored by:
Sponsored by:

Battery or Alternator Issue?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 05-01-2022, 12:09 AM
  #1  
Junior Member
Thread Starter
 
one80's Avatar
 
Join Date: Jan 2009
Posts: 30
Received 1 Like on 1 Post
n/a
Battery or Alternator Issue?

Keep having issues with the battery running flat.
Never get a light while driving.

Last time it had been sitting for a week. I thought fair enough, and charged it over a weekend.
It ran for a few days, then wouldn't start again.
Charged it overnight, and it starts.

The battery is fairly new - 2yrs old.
I've got it booked in for a service, and to look at this (and a few other minor niggles).

Does it sound like the alternator might've gone?
What should the battery readings in the service menu be? Mine are:
Off - UB: 12.2v IB: -12.2A
Idle - UB: 14.6v IB: 4.2A (fluctuates)



Old 05-01-2022, 08:54 AM
  #2  
MBWorld Fanatic!
 
HLG600's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 3,800
Received 239 Likes on 185 Posts
R230 SL63 | W220 S55
It sounds like a parasitic draw.


Tool Used:
Amazon Amazon


Battery condition is easy to diagnose at home. Bring it to a full charge and then load test it.

Tester:
Amazon Amazon
Old 05-02-2022, 03:18 PM
  #3  
Junior Member
 
Nathan Grimmer's Avatar
 
Join Date: Apr 2019
Posts: 63
Received 9 Likes on 6 Posts
-
Cell gone in battery, needs a proper test

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Battery or Alternator Issue?



All times are GMT -4. The time now is 03:30 PM.