Alternator 170A Compatible With 2020-23 Gmc Sierra 3500Hd

ALTERNATOR 12V 170 Amp CW SC6 — GM HD AUXILIARY GENERATOR:

THREE CHECKS BEFORE YOU BUY:
• Position: the auxiliary unit in a dual alternator truck
• Count: two alternators on the engine
• Output: 170 Amp clockwise
• Case number: 85671415 85563635 84874680 or 84677779
• GM describes this part as Generator Assembly Aux

CHEVROLET SILVERADO 2500HD:
• Chevrolet Silverado 2500HD 6.6L L8T VIN 7 (2020-2023)
• Chevrolet Silverado 2500HD 6.6L L5P Duramax VIN Y (2020-2023)
• Work Truck Custom LT LTZ and High Country trims

CHEVROLET SILVERADO 3500HD:
• Chevrolet Silverado 3500HD 6.6L L8T VIN 7 (2020-2023)
• Chevrolet Silverado 3500HD 6.6L L5P Duramax VIN Y (2020-2023)
• Single rear wheel and dual rear wheel

GMC SIERRA 2500HD AND 3500HD:
• GMC Sierra 2500HD 6.6L L8T VIN 7 (2020-2023)
• GMC Sierra 2500HD 6.6L L5P Duramax VIN Y (2020-2023)
• GMC Sierra 3500HD 6.6L L8T VIN 7 (2020-2023)
• GMC Sierra 3500HD 6.6L L5P Duramax VIN Y (2020-2023)
• Base SLE SLT AT4 and Denali trims

DUAL ALTERNATOR TRUCKS — READ THIS FIRST:
• GM describes this part as Generator Assembly Aux
• It is the auxiliary unit in the factory dual alternator system
• A truck ordered with one alternator does not carry it
• The primary generator is a separate GM part number
• Look for two alternators on the front of the engine
• The auxiliary sits alongside the primary on its own bracket

ONE PART FOR BOTH ENGINES:
• 6.6L L8T petrol V8 6571cc 401 CID naturally aspirated VIN 7
• 6.6L L5P Duramax turbo diesel 6599cc 403 CID VIN Y
• GM lists both engines under one auxiliary alternator
• The eighth digit of the VIN tells the engines apart
• 7 is the petrol V8 and Y is the Duramax

PART NUMBER CHAIN:
• GM 84677779 superseded by 84874680
• GM 84874680 superseded by 85563635
• GM 85563635 superseded by 85671415
• GM 85671415 is the current number
• All four describe this one auxiliary alternator
• Mitsubishi Electric builds the unit for GM

OEM PART NUMBERS:
• GM: 85671415 / 85563635 / 84874680 / 84677779
• Mitsubishi Electric: A002TV1182AC / A2TV1182AC
• Mitsubishi Electric: A002TV1182BC / A2TV1182BC
• Long and short Mitsubishi Electric forms are one number

HOW TO VERIFY FIT:
• Match 85671415 85563635 84874680 or 84677779 on your original
• Count two alternators on the front of the engine
• Confirm 170 Amp on the nameplate
• Confirm the eighth VIN digit reads 7 or Y

WHAT THIS UNIT IS:
• Output: 12 Volt 170 Amp clockwise
• Position: auxiliary generator in a dual alternator truck
• Pulley: 6-groove serpentine decoupler (SC6)
• Regulator: Internal • Fan: Internal • Ground: Negative
• Engines: 6.6L L8T petrol and 6.6L L5P Duramax
• Trucks: Silverado and Sierra 2500HD and 3500HD 2020-2023