Select Model
US
Add to Wish List
100k+ Customers' Top Choice
Chosen by over 100,000 customers for trusted quality and exceptional service.
1 Year Warranty
Enjoy a full year of warranty, ensuring long-lasting reliability and peace of mind.
90-Day Return
Hassle-free 90-day return policy for a risk-free shopping experience.
24/7 Service
Round-the-clock support to assist you whenever you need it.
12V Alternator 3936680 for Cummins Engine 6BT 6BT5.9 4B3.9 6B5.9 B5.9 QSB5.9G
Replacement Part Number: 3936680, 393668000, 26021253, 275415400101
Fit for Engine: Cummins 6BT, 6BT5.9, 4B3.9, 6B5.9, B5.9 GAS PLUS CM556, QSB5.9G
| Brand: | FridayParts |
| Compatible Engine Brand: | For CUMMINS |
| Engine Number: | 6BT5.9, 4B3.9, 6B5.9, 6BT, QSB5.9G |
| Replacement Part Number: | 3936680, 393668000, 26021253, 275415400101 |
Ships to:
Delivery:
Choose options for shipping rates.
Top Reviews
Reviewed on 01/10/2026
It fits and it works on our Cu...
Was this review helpful?
0
0
Response from Staff
Thank you for your great feedback! We’re glad to hear the part fits and works well with your Cummins 4BT engine. We truly appreciate your support!
Reviewed on 18/09/2026
2V Alternator 3936680 for Cummins Engine 4BT
Was this review helpful?
0
0
1