Not as in a alternator but as in a battery charger, I heard somewhere that the battery has to be charged off another battery or off an alternator, battery chargers will only shorten the life of them.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k