The battery warning light in my 1998 C280 won't light up when I turn on the ignition and it is not a blown globe as I have already test it and its ok.

 

A update on the battery light. While checking fuses under the hood I found a single blue wire unplugged from what I believe is the front sam unit. Plugged back in light now works and it not only lets you know that the alternator is charging or not it also helps the alternator start charging which was my issue. But now one of my globes that illuminate the odometer is out. So instrument panel must come out again. Dam it.