Battery could still be bad.
Have you tried a voltage drop test between the alt and the battery? Cable could be bad.
Heck you may have an accessory draining you such as the trunk light...
Are you doing many stop/starts? Lots of stop/go driving with most accessories on such as light, HVAC on high, etc? I killed a few batteries this way as the alternator cannot keep up like this.
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I'm not a doctor, but I'll have a look. 
'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k
Six others from BMW, GM, and Ford.
Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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