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GM 20757890
Alternator

2005-2009 GM

Customer Questions & Expert Answers (5)
GM 20757890 Alternator
  • Part Description
    Generator Assembly
  • Replaces
    10366269, 15208916
  • 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 GM
    Manufacturer Part Number20757890
    Part DescriptionGenerator Assembly
    Other NamesGenerator, Engine Electrical
    Item Dimensions10.1 x 7.9 x 8.0 inches
    Item Weight14.50 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    Replaces10366269, 15208916
    ManufacturerGeneral Motors
    SKU20757890
    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 Trim Engine
    2005-2009 Buick LaCrosseCX, CXL6 Cyl 3.8 L GAS
    2005-2008 Pontiac Grand PrixBase, GT, GTP6 Cyl 3.8 L GAS
  • Customer Questions & Expert Answers

    Q:
    Can you help me check if this 20757890 is the right part for my car? Posted by ChevyPartsGiant Specialist
    A:
    Please Select Your Vehicle model to see if part number 20757890 is suitable before ordering.
    Posted by ChevyPartsGiant Specialist
    Q:
    How to replace the alternator (LY7) on Buick LaCrosse? Posted by Customer
    A:
    The first step to replace the generator (LY7) requires removal of the Drive Belt from the generator and disconnection of the battery negative cable. First support the vehicle with jack stands before you disconnect both the electrical connector and generator from its system. Access the generator outlet bat terminal by relocating its protective boot and removing the generator output bat terminal nut so you can disconnect the battery positive lead. The generator installation process starts by removing lower bolts then lowering the vehicle before the final removal step of the generator upper bolt. Position the generator on the engine first then mount the generator upper bolt for installation. Support the vehicle through its lift position while tightening lower generator bolts to a torque setting of 50 n.m (37 lb ft). Use a 10 n.m (89 lb in) torque wrench to tighten the battery positive lead between the generator and bat terminal then install the bat terminal boot. Before lowering the vehicle the generator's electrical connector must be connected followed by Drive Belt installation to the generator and lastly negative Battery Cable reinstallation.
    Posted by ChevyPartsGiant Specialist
    Q:
    What should be done after raising and supporting it again for the 2006 Buick LaCrosse? Posted by Customer
    A:
    Install the generator lower bolts, tightening them to 50 N.m (37 lb ft).
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    What should be removed to gain access for generator removal for the 2008 Buick LaCrosse? Posted by Customer
    A:
    Remove the torque struts and rotate the engine.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Alternator
    Q:
    What needs to be disconnected from the generator for the 2005 Buick LaCrosse? Posted by Customer
    A:
    Take off the generator B+ terminal nut, the battery cable, and the generator electrical connector.
    Posted by ChevyPartsGiant Specialist
    See expert answers on similar Alternator
    If you have any questions about this product, please don't hesitate to ask us. We will be happy to help you!

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