Grounding needs to be just as big as the Positive side. On every alternator I've seen, this is done through the chassis of the alternator to the block.

On the old alternator, You have these connections:
(2) B+ wires that connect to the same location on the terminal strip
(1) D+ wire that connects internally to field and externally to the charge indicator.

The new alternator should connect nearly identical. (I'm thinking that both studs connect to the terminal strip)......I used to have a link to an electrical rebuild place. I'll see if I can find it and repost.

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Sam

84 300SD 350K+ miles ( Blue Belle )