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What I am reading from these posts is this: ground the alternator case to the engine and the engine to the frame via direct heavy connections (metal-metal heavy gauge wires).



Pre 80's it was usually grounded vis a the mounting of the unit. If the alternator has isolated mounts then either a mount needs to be electrically bypassed or the grounding stud utilized by wiring to a suitable ground, preferably the engine. You are good to go.