Powermaster 12si Style GM Alternators


Powermaster
Powermaster 12si Style GM Alternators

Product images may differ from actual product appearance.

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




  • 12si Alternators

    713-17294
    Chrome GM Delco-Style Alternator
  • 100 amps
  • 1 or 3 wire hookup
  • Does Not Include Charging Wire
    View this item

    Fits Applications
  • $141.99
    Ships
    05/29/12

    713-27294
    Polished GM Delco-Style Alternator
  • 100 amps
  • 1 or 3 wire hookup
  • Does Not Include Charging Wire
    View this item

    Fits Applications
  • $141.99
    Ships
    05/29/12

    713-37293
    Chrome GM Delco-Style Alternator
  • 140 amps
  • Does Not Include Charging Wire
    View this item

    Fits Applications
  • $181.99
    Ships
    05/29/12

    713-37294
    Chrome GM Delco-Style Alternator
  • 140 amps
  • 1 or 3 wire hookup
  • Includes cover
  • Includes Charging Wire
    View this item

    Fits Applications
  • $226.99
    Ships
    05/29/12
      713-37294-114
    Chrome GM Alternator
  • 140 Amp
  • Includes Baffled Fan and 6-Rib Serpentine Pulley
  • 1-Wire (Included)
    More info on Powermaster 37294-114

    Fits Applications
  • $234.99
    Ships
    05/29/12

    713-47294
    Natural GM Delco-Style Alternator
  • 140 amps
  • Includes Charging Wire
    View this item

    Fits Applications
  • $159.99
    Ships
    05/29/12

    713-57294
    Black GM Delco-Style Alternator
  • 140 amps
  • Includes Charging Wire
    More info on Powermaster 57294

    Fits Applications
  • $177.99
    Ships
    05/29/12

    713-67294
    Polished GM Delco-Style Alternator
  • 140 amps
  • 1 or 3 wire hookup
  • Includes cover
  • Includes Charging Wire
  • Single Groove Pulley
    View this item

    Fits Applications
  • $241.99
    Ships
    05/29/12

    713-7294
    Natural GM Delco-Style Alternator
  • 100 Amp (internal regulator)
  • V-Belt
  • 1-Wire
    View this item

    Fits Applications
  • $121.99
    Ships
    05/29/12
    12si Race Prepped Alternators

    713-8002
    Natural GM Delco-Style Alternator
  • 100 amps
  • 1 or 3 wire hookup
  • Does Not Include Charging Wire
    View this item

    Fits Applications
  • $119.99
    Ships
    05/29/12