Thanks to all. I was confusing the plug for the voltage regulator and the harness connections. THe plug-in Bosch is a 70 amp unit. You're all correct the Diesels require the 80 amp AL 66X. I've owned my 350 for 25 of it's 29 years and I must say 29 years and 205,000 not bad service for the factory alternator.

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1990 350 SDL
Currently: 180,000 miles
Factory rebuilt bottom end rods, bearings and head gasket @ 75,000 in 1997