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GMC 20989650 Generator Assembly

2005-2010 GMC

Customer Questions & Expert Answers (3)
20989650 GM Generator Assembly Illustration 1 of 1
  • Part Description
    Generator, Engine Electrical
  • Replaced By
    19244751
  • Manufacturer
    General Motors
Make sure this part fits
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  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GMC
    Manufacturer Part Number20989650
    Part DescriptionGenerator Assembly; Generator, Engine Electrical
    Item Dimensions9.5 x 8.1 x 7.3 inches
    Item Weight16.60 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU20989650
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2005-2010 GMC Savana8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.6L Diesel1 TON CARGO EXPRESS, 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON CARGO SAVANA, 1/2 TON PASSENGER EXPRESS, 1/2 TON PASSENGER SAVANA, 3/4 TON CARGO EXPRESS, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER EXPRESS, 3/4 TON PASSENGER SAVANA
    2006-2007 GMC Sierra8 Cyl 6.0L1500 CREW CAB LONG BOX, 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB LONG BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB, 3500 CHASSIS EXTENDED CAB 161.5, 3500 CHASSIS REGULAR CAB 137.0, 3500 CHASSIS REGULAR CAB 161.5, 3500 CREW CAB, 3500 EXTENDED CAB, 3500 REGULAR CAB, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB STANDARD BOX, CLASSIC 2500 EXTENDED CAB LONG BOX, CLASSIC 2500 EXTENDED CAB STANDARD BOX, CLASSIC 2500 REGULAR CAB, CLASSIC 3500 CHASSIS EXTENDED CAB 161.5, CLASSIC 3500 CHASSIS REGULAR CAB 137.0, CLASSIC 3500 CHASSIS REGULAR CAB 161.5, CLASSIC 3500 CREW CAB, CLASSIC 3500 EXTENDED CAB, CLASSIC 3500 REGULAR CAB
    2006 GMC Yukon8 Cyl 6.0L3/4 TON
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you.
    A:
    You can Select Your Vehicle to check if 20989650 fits your vehicle.
    Posted and answered by GM Parts Specialist Henry
    Q:
    How do you remove the Alternator from its mounting bracket for the 2009 Chevrolet Express? Posted by Lefort J.
    A:
    Remove the front and rear alternator mounting bolts. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Henry / Aug 30, 2025
    Q:
    What should you do next after removing the air intake duct and accessory drivebelt for the Alternator on the 2007 GMC Sierra? Posted by Verified Customer
    A:
    Detach the clip for the engine wiring harness from the air conditioning compressor and condenser hose bracket and remove the bolt from the bracket that secures the air conditioning compressor and condenser hose. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Nicholas / Jan 12, 2025

Genuine GM Part 20989650, the Right Choice

To ensure reliability, purchase GM part # 20989650 Generator Assembly. It is sometimes referred to as GMC Alternator. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific GMC Savana, Sierra, Yukon models.

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