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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 135 Amp and Above

Diesel Parts Direct carries a great selection of new and remanufactured 12 Volt alternators ranging from 135 to 200 Amp for Cummins diesel engines, including 21SI, 22SI, 24SI, 33SI, 34SI, and E8 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-3099841

ALTERNATOR - 34SI (12V, 135A)

Also Available in Remanufactured

$739.32

Qty:

Ships in 1-2 days

DS-3604668

ALTERNATOR - 21SI (12V, 145A)

$347.38

Qty:

Ships in 1-2 days

DS-3675161

ALTERNATOR (12V, 160A, INTERNAL REGULATOR, EXTERNAL FAN)

$562.71

Qty:

Ships in 1-2 days

DS-3675219

ALTERNATOR - 34SI (12V, 135A)

$739.32

Qty:

Ships in 1-2 days

DS-3675221

ALTERNATOR - 34SI (12V, 135A)

Also Available in Remanufactured

$767.20

Qty:

DS-3675228

ALTERNATOR - 22SI (12V, 145A)

$308.96

Qty:

Ships in 1-2 days

DS-3675228-NW

ALTERNATOR - 22SI (12V, 145A)

$308.96

Qty:

Ships in 1-2 days

DS-3675229

ALTERNATOR - 22SI (12V, 145A)

$308.96

Qty:

Ships in 1-2 days

DS-3675233

ALTERNATOR - 33SI (12V, 135A)

$673.51

Qty:

Ships in 1-2 days

DS-3675233-NW

ALTERNATOR - 33SI (12V, 135A)

$673.51

Qty:

Ships in 1-2 days

DS-3675234

ALTERNATOR - 34SI (12V, 135A, INTERNAL REGULATOR, EXTERNAL FAN)

$738.69

Qty:

Ships in 1-2 days

DS-3675234-NW

ALTERNATOR - 34SI (12V, 135A, INTERNAL REGULATOR, EXTERNAL FAN)

$738.69

Qty:

Ships in 1-2 days

DS-3675528

ALTERNATOR - 22SI (12V, 145A)

Also Available in Remanufactured

$308.96

Qty:

Ships in 1-2 days

DS-3675528-NW

ALTERNATOR - 22SI (12V, 145A)

Also Available in Remanufactured

$308.96

Qty:

Ships in 1-2 days

DS-3679712

ALTERNATOR - 22SI (12V, 145A)

Also Available in Remanufactured

$342.15

Qty:

Ships in 1-2 days

DS-3680140

ALTERNATOR - 33SI (12V, 135A)

Also Available in Remanufactured

$673.51

Qty:

Ships in 1-2 days

DS-3920616

ALTERNATOR - 21SI (12V, 160A, INTERNAL REGULATOR, EXTERNAL FAN)

Also Available in Remanufactured

$392.55

Qty:

Ships in 1-2 days

DS-3935528

ALTERNATOR - 22SI (12V, 145A)

Also Available in Remanufactured

$308.96

Qty:

Ships in 1-2 days

DS-3935529

ALTERNATOR - 22SI (12V, 145A)

Also Available in Remanufactured

$308.96

Qty:

Ships in 1-2 days

DS-3972734

ALTERNATOR - 24SI (12V, 160A)

Also Available in Remanufactured

$550.27

Qty:

Ships in 1-2 days

DS-4936878

ALTERNATOR - 24SI (12V, 160A)

Also Available in Remanufactured

$550.27

Qty:

Ships in 1-2 days

DS-5264312

ALTERNATOR - E8 (12V, 200A)

$535.30

Qty:

Ships in 1-2 days

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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