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Old 09-26-2006, 05:49 AM
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75gmck25 75gmck25 is offline
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Switch from 10si to 12si alternator

The original alternator on my '75 GMC pickup was a 63 amp 10si. I can switch to a newer 94 amp 12si with the same clocking, and its a direct bolt in. However, I also want to upsize the charge wire to 8 gauge with a 12 gauge fusible link.

When I run the new charge wire, should I use the original routing, which goes from the alternator down to the starter, or should I make a more direct connection to the batteery? Some of the newer trucks ('96-'99 vintage) use a charge wire directly from the bat terminal on the alternator to the battery, and do not route it down to the starter.

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