GM Genuine Parts Alternator
OE
Pack of 1

GM Genuine Parts Alternator

GM Part #13566905

ACDelco Part #13566905

MSRP$590.84*

GM Genuine Parts Alternators are designed, engineered, and tested to rigorous standards, and are backed by General Motors.

  • Consistent power is provided for lights and interior electronics
  • Maintains steady electrical performance throughout your daily commute
  • Converts mechanical energy into electrical power for the vehicle

Pack of 1

About this product

GM Genuine Parts Alternators are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Do your headlights dim or dash flicker while idling? It may be time for a new alternator. These alternators convert engine-driven mechanical energy into electrical power, acting as the hub of the charging system to keep the battery charged while supplying steady voltage to lights, ignition, and onboard electronics. By maintaining proper energy flow, they help prevent unexpected battery drains, rough running from low system voltage, and sudden stalling when electrical demand spikes in hot or cold weather. Built to meet the design intent of the original charging system and end-of-line tested for dependable output, they integrate materials and technologies for consistent daily performance. Available in new General Motors parts for original factory quality and in remanufactured options rebuilt to GM standards. GM Genuine Parts are the true OE parts installed during the production or validated by General Motors for GM vehicles.

Warning WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

  • Consistent power is provided for lights and interior electronics
  • Maintains steady electrical performance throughout your daily commute
  • Converts mechanical energy into electrical power for the vehicle
  • Handles the heavy electrical loads of modern daily driving
  • Works alongside the battery to manage overall electrical demand
  • Acts as the central hub of the automotive charging system
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies

Voltage12DC
Pulley Belt TypeSerpentine
Pulley Groove Quantity4
Drive End To Pulley 1st Groove Distance2.24 in / 56.85 mm
Split Mounting Foot Overall Inner Spacing2.02 in / 51.2 mm
Case Circumference5.63 in / 143 mm
Distance Between Mounting Feet5.15 in / 130.7 mm
Terminal Quantity2
ClassificationOE
Split Mounting Foot Overall Outside Spacing3.54 in / 90 mm
Outside Pulley Diameter2.37 in / 60.22 mm
Mounting TypeFront Mount
Plug Type365
Decoupled Or Clutch PulleyYes
One Wire CapableYes
External Fan IncludedNo
AC Service TapNo
Fan TypeInternal
Regulator TypeInternal
Ground TypeNegative
Plug Clock Rear View Main Mounting Ear at 6 O Clock11
External Regulator IncludedNo
Case MaterialAluminum
Case ColorNatural
FinishUncoated
Pulley IncludedYes
Grade TypeStandard Replacement
Amperage Rating156A
Rotation DirectionClockwise (Right)

24 Months/Unlimited Miles Limited Warranty for Parts (plus Labor if installed by a GM dealer)

Please visit our warranty page on Gmparts.com for full warranty details.

Before purchasing and installing an altenators, make sure it is the correct fit for your vehicle

  • When making repairs on electrical systems, in-depth diagnosis by a trained techncian is needed before parts replacement. This includes checking battery health and diagnostic trouble codes.
  • It is also important that all electrical connections are kept clean and firmly attached, which will make sure the battery is being properly charged by the alternator.
  • Regularly inspect altenators for signs of damage or wear, and replace them if signs of damage are found

Before purchasing and installing an altenators, make sure it is the correct fit for your vehicle

  • When making repairs on electrical systems, in-depth diagnosis by a trained techncian is needed before parts replacement. This includes checking battery health and diagnostic trouble codes.
  • It is also important that all electrical connections are kept clean and firmly attached, which will make sure the battery is being properly charged by the alternator.

ModelBody StyleTrimYear(s)
Acadia2024, 2025, 2026, 2027

Frequently Asked Questions

Yes, always consult the Vehicle Owner's manual or an expert technician before making any repairs or adjustments.

No, some vehicles require more amperage than others depending on the amount of electronics that need to be operated. Consult the vehicle's information for proper application.