Powermaster 47294 - Powermaster 12si Style GM Alternators

Powermaster 47294 - Powermaster 12si Style GM Alternators

Powermaster #713-47294

Natural GM Delco-Style Alternator
  • 140 amps
  • Includes Charging Wire
  • $159.99 Ships
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    Powermaster 47294 - Powermaster 12si Style GM Alternators

    Powermaster 47294 - Powermaster 12si Style GM Alternators

    GM has offered several series of alternators over the years, each time taking a step up in performance. The great thing about these alternators and aftermarket brackets is that for the most part they are interchangeable. Starting with the externally regulated 10dn alternator of the 1960s and moving all the way to the CS130D alternator of late, aftermarket brackets with rod end tensioners will interchange. The 2" mounting foot width is common to all of them and the 6.61" bolt spacing is common (except the CS130D. the CS130D is a 7.24" bolt spacing although many brackets will accommodate this.)

    12si Alternators
    100A Specifications
    70A @ 2,400 rpm @ 13.2 VDC @ 77F
    Operating Range: -40C to 150C
    Max rpm: 18,000

    140A Specifications
    80A @ 2,400 rpm @ 13.2 VDC @ 77F
    Operating Range: -40C to 150C
    Max rpm: 18,000

  • The Ultimate Custom Billet look at affordable prices
  • Smooth die cast housing with teardrop design
  • One or three wire
  • Available in 100 and 140 amp output.
  • Custom HV (high volume) fan - optional
  • Largest selection of fans, pulleys, nose cones, and baffle plates in the industry
  • Smooth back with special Powermaster vents for pull through cooling
  • Gold battery post
  • Available in 4 finishes
  • Proof of performance tags


    12si Race Prepped Alternators
    80A Specifications
    70A @ 2,400 rpm @ 13.2 VDC @ 77F
    Operating Range: -40C to 150C
    Max rpm: 18,000

    100A Specifications
    80A @ 2,400 rpm @ 13.2 VDC @ 77F
    Operating Range: -40C to 150C
    Max rpm: 18,000
  • One or three wire operation
  • Complete w/fan & V-belt pulley
  • Gold battery post
  • 70 AMPS at idle for 100A Alternator
  • Recommended charge wire size: 8 AWG
  • Proof of Performance tag


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