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Hummer 25877026 GENERATOR Assembly

2008-2009 Hummer H2

Customer Questions & Expert Answers (9)
GM 25877026 GENERATOR Assembly
  • Part Description
    Generator Asm ; Generator, Engine Electrical
  • Replaces
    15857608, 15905871
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Product Specifications
  • Vehicle Fitment
  • Customer Questions & Expert Answers
  • Product Specifications

    BrandGenuine Hummer
    Manufacturer Part Number25877026
    Part DescriptionGenerator Asm ; Generator, Engine Electrical
    Other NamesAlternator
    Item Dimensions9.6 x 8.1 x 8.0 inches
    Item Weight19.80 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces15857608, 15905871
    ManufacturerGeneral Motors
    SKU25877026
    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
    2008-2009 Hummer H28 Cyl 6.2L, 8 Cyl 6.2L FlexPICKUP, SUV
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you. Posted by GMPartsGiant Specialist
    A:
    You can Select Your Vehicle to check if 25877026 fits your vehicle.
    Posted by GMPartsGiant Specialist
    Q:
    How to Remove the Alternator on Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL? Posted by Customer
    A:
    To remove the alternator on a V6 model, start by disconnecting the cable from the negative battery terminal and removing the air intake duct and accessory drive belt. Unbolt the clamp that secures the heater outlet hose to the alternator mounting bracket, disconnect the electrical connector from the alternator, and peel back the weather boot from the B+ terminal to remove the battery cable from the alternator. Finally, remove the alternator mounting bolts and the alternator. The installation is the reverse of removal. On V8 models, follow similar removal steps as the V6 models. Again, installation is the reverse of removal.
    Posted by GMPartsGiant Specialist
    Q:
    What is the first step in disconnecting the alternator for the 2014 Cadillac Escalade? Posted by Customer
    A:
    Disconnect the cable from the negative battery terminal.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    What should you do next after removing the air intake duct and accessory drivebelt for the 2007 Chevrolet Avalanche? Posted by 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.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    How is the process different for the 2013 Chevrolet Silverado? Posted by Customer
    A:
    For a V8 model, instead of detaching the clip and bolt for the air conditioning compressor and condenser hose bracket, you simply peel back the weather boot from the B+ terminal and disconnect the battery cable from the alternator. Then, remove the electrical connector and two alternator mounting bolts before removing the alternator.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    How do you install the alternator on the 2010 GMC Sierra? Posted by Customer
    A:
    The installation process is simply the reverse of removal.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    What should you do next after removing the air intake duct and accessory drivebelt for the 2010 GMC Yukon? Posted by 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.
    Posted by GMPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    Would a 140 amp or a 160 amp be better for a vehicle? Posted by Customer
    A:
    The amperage needed varies on how many accessories the vehicle is running
    Posted by GMPartsGiant Specialist 10/1/2020
    Q:
    How many amps does this alternator produce? Posted by Customer
    A:
    This alternator is a 160 amp alternator
    Posted by GMPartsGiant Specialist 9/1/2020
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

Genuine GM Part 25877026, the Right Choice

To ensure reliability, purchase GM part # 25877026 GENERATOR Assembly. It is sometimes referred to as Hummer 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 Hummer H2 models.

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