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Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

Our office will be closed 9/7/2026 in observance of Labor Day. Orders placed during this time will be processed when our office opens 9/8/2026.

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12 Volt Alternators for Cummins Engines 100 Amp to 130 Amp

Diesel Parts Direct carries a great selection of new and remanufactured 12 Volt alternators ranging from 100 to 130 Amp for Cummins diesel engines, including 15SI, 21SI, 22SI, 24SI, 27SI, 30SI, 33SI, and 34SI models.

If you do not see the part you are looking for, please use our quote request form or call us at 888.687.0539: our knowledgeable inside sales staff will gladly assist you.

DS-3056492

ALTERNATOR - 30SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

Also Available in Remanufactured

$702.97

DS-3062333

ALTERNATOR - 30SI (12V, 105A)

Also Available in Remanufactured

$609.40

DS-3072483

ALTERNATOR - 30SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

Also Available in Remanufactured

$702.97

DS-3400582

ALTERNATOR - 33SI (12V, 110A, INTERNAL REGULATOR, EXTERNAL FAN)

Also Available in Remanufactured

$672.51

DS-3400698

ALTERNATOR - 33SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

Also Available in Remanufactured

$899.28

DS-3604474

ALTERNATOR - 15SI (12V, 105A)

$384.41

DS-36044746

ALTERNATOR - 15SI (12V, 105A)

$384.41

DS-3604652

ALTERNATOR - 30SI (12V, 105A)

$609.40

DS-3604659

ALTERNATOR - 27SI (12V, 100A)

$428.23

DS-3604687

ALTERNATOR - 30SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

$702.97

DS-3675103

ALTERNATOR - 30SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

$702.97

DS-3675104

ALTERNATOR - 30SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

$702.97

DS-3675156

ALTERNATOR - 21SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

$369.75

DS-3675157

ALTERNATOR - 21SI (12V, 130A, INTERNAL REGULATOR, EXTERNAL FAN)

$366.66

DS-3675218

ALTERNATOR - 34SI (12V, 110A)

$795.45

DS-3675222

ALTERNATOR - 22SI (12V, 100A)

$338.96

DS-3675235

ALTERNATOR - 33SI (12V, 100A, INTERNAL REGULATOR, EXTERNAL FAN)

$899.28

DS-3675236

ALTERNATOR - 33SI (12V, 110A, INTERNAL REGULATOR, EXTERNAL FAN)

$672.51

DS-3675243

ALTERNATOR - 34SI (12V, 110A)

$702.02

DS-3903231

ALTERNATOR - 15SI (12V, 105A)

Also Available in Remanufactured

$384.41

DS-3909981

ALTERNATOR - 15SI (12V, 105A)

Also Available in Remanufactured

$384.41

DS-3920615

ALTERNATOR - 21SI (12V, 130A, INTERNAL REGULATOR, EXTERNAL FAN)

Also Available in Remanufactured

$345.11

DS-3935527

ALTERNATOR - 22SI (12V, 100A)

Also Available in Remanufactured

$338.96

DS-3947412

ALTERNATOR - 33SI (12V, 110A, INTERNAL REGULATOR, EXTERNAL FAN)

$672.51

DS-3972732

ALTERNATOR - 24SI (12V, 100A)

$571.01

DS-4936876

ALTERNATOR - 24SI (12V, 100A)

Also Available in Remanufactured

$571.01

888.687.0539 (U.S.)|225.706.4858 (Int.)

Monday-Friday 7am-5pm CST
8784 S. Choctaw Dr. Baton Rouge, LA 70815
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Caterpillar® and all of the Caterpillar® engine models listed on this website are registered trademarks of Caterpillar, Inc. Cummins® and all of the Cummins® engine models listed on this website are registered trademarks of Cummins. Detroit Diesel® and all of the Detroit Diesel® engine models listed on this website are registered trademarks of Daimler AG. John Deere® and all of the John Deere® engine models listed on this website are registered trademarks of John Deere. Allison Transmission® and all of their transmission models listed on this website are registered trademarks of Allison Transmission®. Diesel Parts Direct is not an authorized dealer for Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission. None of the parts beginning with "DS" or "R" are genuine Caterpillar, Cummins, Detroit Diesel, John Deere, or Allison Transmission items.

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