Alternator illustration – not the actual part
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Alternator illustration – not the actual partDiesel Parts Direct logo

Aftermarket parts may appear slightly different, including the packaging.

AccessoriesStarters and Alternators12V 95A and Under

DS-3675174 Alternator For 21SI Cummins Diesel Engines

(12V, 70A, Internal Regulator, External Fan)

OEM #: 3675174SKU: DS3675174

Ships in 1-2 days

$458.58

Taxes and Shipping are calculated at checkout

Special Order Item - not eligible for return

This high quality aftermarket alternator can be used on Cummins engines and is guaranteed to meet OEM specifications.

SKU DS3675174
OEM Number 3675174
Part Type Alternators
OEM Brand CUMMINS

Aftermarket warranty

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  • Orders are processed the same or next business day
  • Expedited shipping options available at Checkout
  • If same-day shipping is critical, please call to confirm availability

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Call any of our friendly Parts Dept. Specialists with your engine serial number, and we can quickly verify whether this part is the correct part for your engine — no guesswork.

Phone: 888.687.0539

Don't know how to find your engine serial number? Go to our Engine Help Center for assistance.