I just replaced my alternator and serpentine belt. I am not sure if I have the tension set correctly. The indicator is at the low end of the ramp. It does not move when I tighten the adjusting nut. The tensioner does not appear to be frozen as it moves when I push or pull on the belt. The belt just doesn't seem as tight as it should be as I see it flutter on idle between the longer distances between pulley's. This is a 1991 300E 4matic. Thanks for any and all help.

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Handyjay