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Sinister Diesel 250 Amp OEM High Output Alternator for 2013-2018 GM Duramax 6.6L

Was: $687.70
Sale: $529.00
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Save: $158.70

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Whether you're working, towing or racing, a proper charging system is crucial in keeping your GM Duramax diesel engine operational. Don't let a faulty OEM alternator leave you stranded. This 2013-2018 Duramax 6.6L 250 amp alternator is trusted by many Diesel repair shops and stores to be the “fix-all solution” for the GM Duramax 6.6L alternator failures, which may cause PDM failures due to low voltage from the lack of alternator power that comes from the factory.

Instead of a remanufactured alternator, Sinister Diesel's 2013-2018 Duramax 6.6L 250 amp alternator proudly uses brand new OEM alternator components such as the stator, rotor, rectifier and regulator to give our customers peace of mind to match our standard of quality. This alternator is a direct fit replacement part without any need for modifications, and it's sure to stand up to just about any conditions with an upgraded high-output regulator, high-temperature bearings and a cast aluminum chassis that comes powder-coated in the signature Sinister Diesel blue finish.

Best of all, the 2013-2018 Duramax 6.6L 250 amp alternator comes fully backed from Sinister Diesel with a one-year warranty.

Features and Benefits:

  • Cast Aluminum Chassis
  • Powder Coated in Sinister Blue
  • Upgraded High Output Regulator
  • Upgraded High-Temperature Bearings
  • 1 Year Warranty


  • High Output 250 Amp Alternator

Note: Because this product exceeds OEM specifications, you must include a High Amp Wiring Upgrade Kit at the time of purchase to maintain the Alternator warranty and prevent damaging the under-sized OEM wiring.


  • Q: Does this item have a warranty?
  • A: Yes. This item comes with a 1-Year Warranty.


Shipping Information

  • Item Requires Shipping
  • 15.0 lbs.
  • W10.0000” x H10.0000” x L10.0000”
  • Free Shipping!

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