Perhaps check witht he charging system.

Check the brushes int he alternator if it has them, and if they are very short, replace them.

Take it to you local auto store that does repairs, and have them test the charging system.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U