BenzWorld Junior Member
Date registered: Jul 2017
Vehicle: 1985 500sel 1991 300sel
Location: Northern Michigan
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
I dont beleive any of that, yes when the key is on and car is not running battery light will be on.
The battery light has Battery positive to one side all the time, and when it is running battery positive to the other side. When it stops charging, alternator not spinning or no output it supplies ground to the light to illuminate it. That being said, check your alternator to be sure.