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Old 12-28-2008, 04:07 PM
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Early SI Alternator Upgrade

A friend has a '72 Chevy truck he uses for plowing. His plow set-up is electric. So, he'd like to upgrade his old SI style alternator to maybe 94 amps.

I know Harbor Freight used to sell upgrade kits for the SI, but apparently not any longer.

Anyone know where an upgrade kit might be purchased? My friend wants to keep the truck original, but will go to a CS style if he has to.

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Old 12-28-2008, 09:41 PM
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I replaced the 63 amp 10si on my '75 GMC with a 94 amp 12si.. My alternator is mounted high on the passenger side, plug is clocked at 3 o'clock, and the 12si I bought was a direct replacement. I also upgraded the charge wire to 8 gauge with a 12 gauge fusible link. I ran the wire directly over from the battery positive to the alternator.

You need to find an SAE (not metric) 12si with a V-pulley (not serpentine) and it should be a very easy swap. If you can't find the right number, I think I could probably find the receipt for mine and get a parts number from it.

Bruce
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