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A 105-amp, 12-volt, one-wire self-exciting alternator built to replace the 10SI unit on GM 305 and 350 small-block and big-block engines. It uses internal regulation, a V-belt pulley and a machined chrome finish, and it is rated at 105 amps, about 40% more than a stock 10SI, which leaves headroom for electric fans, a bigger stereo or extra lights. It suits street rod, hot rod and older Chevy or Buick builds where the original wiring is simple. Against a stock rebuilt 10SI it offers more output and a one-wire hookup, but it is a single V-belt unit, not a serpentine or multi-groove alternator, and it does not fit later GM accessory drives.
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Lowest price we've seen: $67.99 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
It is self-exciting and works with a 1-wire hookup. It is a direct replacement for a malfunctioning original part.
The castings are CNC machined, and the mounting points are measured for proper fit. It has copper windings, triple-sealed bearings and diodes. The bearings are tested to OE standards, and the alternator went through accelerated cycling tests. The 105-amp output is meant to run electric fans, a stereo and off-road lights.
To install it, disconnect the battery's negative terminal first. Then set the drive belt to the correct tension and tighten all screws securely. A belt that is too loose causes power loss, and one that is too tight can damage the bearing.
