GM Genuine Parts Accumulator Piston Seal
OE
Pack of 1

GM Genuine Parts Accumulator Piston Seal

GM Part #85671417

ACDelco Part #85671417

MSRP$388.80*

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.

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  • 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

Product Specifications

Pulley Belt TypeSerpentine
Terminal Quantity3
Case Circumference5.43 in / 138 mm
Distance Between Mounting Feet5.45 in / 138.55 mm
ClassificationOE
Drive End To Pulley 1st Groove Distance2.86 in / 72.74 mm
Outside Pulley Diameter2.57 in / 65.22 mm
Pulley Groove Quantity5
Pulley IncludedYes
Mounting TypeFront Mount
Plug Type365
One Wire CapableYes
Regulator TypeInternal
Ground TypeNegative
External Regulator IncludedNo
Case MaterialAluminum
Case ColorNatural
Plug Clock Rear View Main Mounting Ear at 6 O Clock2
FinishUncoated
External Fan IncludedNo
Decoupled Or Clutch PulleyNo
AC Service TapNo
Fan TypeInternal
Rotation DirectionClockwise (Right)
Grade TypeStandard Replacement
Amperage Rating156A
Voltage12DC

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)
Sierra 15002019, 2020, 2021
Sierra 1500 Limited2022
Yukon2021, 2022
Yukon XL2021, 2022

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.