Hi 79'_240D, welcome to the forum.

I just upgraded my alternator to a 115 amp Bosch AL129X in this thread:

http://www.peachparts.com/shopforum/diesel-discussion/364297-diy-al129x-alternator-1978-w116-300sd.html

Squiggle Dog upgraded to a 80 amp Bosch AL69X alternator in this thread:

http://www.peachparts.com/shopforum/diesel-discussion/335086-installing-upgraded-80-amp-alternator-9-blade-fan-1980-w116-300sd.html

This forum has a lot of great information that can be accessed by the search function or by simply asking for help.

Best of luck on your upgrade. Keep us posted of your progress.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022