Thanks David, I think you are right. Any pointers on readings and measurements, for instance what I can look for with the VOM hooked up to the battery while idling? Also, what type of resistance am I looking for between the alternator body and the negative battery post? Given the great distance, can I use a piece of Romex to assist in accomplishing this measurement?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280