With that year car it could be perfect timing for another battery. Does it have water?

Is the altenator belt tight? An easy way to check is to reach down and try and turn it (engine off of course!) and with the engine cold.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)