The larger "Internal Fan" style alternators actually charge at 14.4V instead of the lazy 13.2-13.5V that the older "External Fan" style max out at. The result is brighter headlights, stronger blower fan, and a more fully charged battery.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)