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  2. Auto Parts
  3. Charging and Starting
  4. Alternator / Generator and Related Components
  5. Alternator
  6. ACDelco 321-2128

ACDelco 321-2128 Alternator

ACDelco 321-2128 Alternator Image 1
ACDelco 321-2128 Alternator Image 2
ACDelco 321-2128 Alternator Image 3
ACDelco 321-2128 Alternator

ACDelco
Brand:ACDelco
Part Number: 321-2128
UPC: 00707773704899
Weight: 15.48 lbs
Condition:Remanufactured



On Sale:

$379.83

Core: See Value In Cart
Availability:
25 in Stock
Warehouse: US-7
Quantity:

Product Information

Description:

Get the ACDelco 321-2128 Alternator for your vehicle. Buy now and secure your purchase online!

GM Genuine Parts Remanufactured Alternators are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Remanufacturing alternators is an industry standard practice that involves disassembly of existing units, and replacing components that are most prone to wear with new components. Damaged and obsolete parts are replaced and are end of line tested to ensure they perform to GM specifications. In addition, remanufacturing returns components back into service rather than processing as scrap or simply disposing of them. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE). ⚠ WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov

Features and Benefits:

  • Remanufacturing is an industry standard practice that returns parts into service rather than scrapping them
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • Tested to ensure they perform to GM specifications

Specifications:

AC Tap:
No
Alternator Case Material:
Aluminum
Amperage Rating:
145 Ampere
Country of Origin 10:
IN
Country of Origin 11:
MY
Country of Origin 12:
CA
Country of Origin 13:
CN
Country of Origin 14:
KR
Country of Origin 15:
DK
Country of Origin 16:
DE
Country of Origin 17:
CH
Country of Origin 6:
BR
Country of Origin 7:
TW
Country of Origin 8:
US
Country of Origin 9:
MX
DE to Pulley 1st Groove (mm):
22mm
External Regulator Included:
No
Family:
Delco AD244
Fan Type:
Internal
Finish:
Aluminum
Ground Type:
Negative
Height (in):
10.25 in
Inside Distance Between Mounting ft (mm):
51
Length (in):
13.88 in
Mounting Type:
1 Pivot ft
One Wire Capable:
No
Plug Clock Rear View Main Mounting Ear at 6 O Clock:
3
Programming Required:
No
Pulley Belt Type:
Serpentine
Pulley Groove Quantity:
6
Pulley Included:
Yes
Regulator Type:
Internal
Rotation Direction:
Clockwise
Terminal Connection Quantity:
4
Voltage:
12 VDC
Weight (lb):
15.48 lb
Width (in):
13.25 in
Country of Origin:
SI

Select a vehicle to narrow ACDelco 321-2128 Alternator fitment info!

Last Updated: 03/01/2024

Years Vehicle Per Vehicle Fit NotesFitment Notes
Showing 100 fitments from page 2 of 2

2005

 

2005

 
GMC Sierra 2500 HD

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Crew Cab Pickup
4 Doors
 

GMC Sierra 2500 HD



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Crew Cab Pickup
4 Doors

1 Per Vehicle

2005

 

2005

 
GMC Sierra 2500 HD

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Extended Cab Pickup
4 Doors
 

GMC Sierra 2500 HD



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Extended Cab Pickup
4 Doors

1 Per Vehicle

2005

 

2005

 
GMC Sierra 2500 HD

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Standard Cab Pickup
2 Doors
 

GMC Sierra 2500 HD



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Standard Cab Pickup
2 Doors

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
GMC Sierra 2500 HD

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
 

GMC Sierra 2500 HD



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)

1 Per Vehicle

2007

 

2007

 
GMC Sierra 2500 HD Classic

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U
 

GMC Sierra 2500 HD Classic



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U

1 Per Vehicle

2007

 

2007

 
GMC Sierra 2500 HD Classic

8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G
 

GMC Sierra 2500 HD Classic



8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G

1 Per Vehicle

2006

 

2006

 
GMC Sierra 3500

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U
 

GMC Sierra 3500



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U

1 Per Vehicle

2006

 

2006

 
GMC Sierra 3500

8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G
 

GMC Sierra 3500



8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G

1 Per Vehicle

2005

 

2005

 
GMC Sierra 3500

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Cab & Chassis
2 Doors
 

GMC Sierra 3500



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Cab & Chassis
2 Doors

1 Per Vehicle

2005

 

2005

 
GMC Sierra 3500

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Cab & Chassis
4 Doors
 

GMC Sierra 3500



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Cab & Chassis
4 Doors

1 Per Vehicle

2005

 

2005

 
GMC Sierra 3500

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Crew Cab Pickup
4 Doors
 

GMC Sierra 3500



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Crew Cab Pickup
4 Doors

1 Per Vehicle

2005

 

2005

 
GMC Sierra 3500

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Extended Cab Pickup
4 Doors
 

GMC Sierra 3500



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Extended Cab Pickup
4 Doors

1 Per Vehicle

2005

 

2005

 
GMC Sierra 3500

6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Standard Cab Pickup
2 Doors
 

GMC Sierra 3500



6.0L V8 CNG OHV,
6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Standard Cab Pickup
2 Doors

1 Per Vehicle

2004

 

2004

 
GMC Sierra 3500

6.0L V8 CNG OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
 

GMC Sierra 3500



6.0L V8 CNG OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
GMC Sierra 3500

6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
 

GMC Sierra 3500



6.0L V8 Gas OHV,
6.6L V8 Diesel OHV Turbo,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)

1 Per Vehicle

2007

 

2007

 
GMC Sierra 3500 Classic

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U
 

GMC Sierra 3500 Classic



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U

1 Per Vehicle

2007

 

2007

 
GMC Sierra 3500 Classic

8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G
 

GMC Sierra 3500 Classic



8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
GMC Yukon

4.8L V8 Gas OHV,
5.3L V8 Flex OHV,
5.3L V8 Gas OHV,
6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
 

GMC Yukon



4.8L V8 Gas OHV,
5.3L V8 Flex OHV,
5.3L V8 Gas OHV,
6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
GMC Yukon XL 1500

5.3L V8 Flex OHV,
5.3L V8 Gas OHV,
6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
 

GMC Yukon XL 1500



5.3L V8 Flex OHV,
5.3L V8 Gas OHV,
6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)

1 Per Vehicle

2006

 

2006

 
GMC Yukon XL 2500

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U
 

GMC Yukon XL 2500



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: LQ4
8th VIN Digit: U

1 Per Vehicle

2006

 

2006

 
GMC Yukon XL 2500

8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G
 

GMC Yukon XL 2500



8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
Eng: L18
8th VIN Digit: G

1 Per Vehicle

2005

 

2005

 
GMC Yukon XL 2500

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
ARLINGTON,TX ASSEMBLY PLANT(ARL), SILAO,MEXICO PLANT(MSL), 145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U
 

GMC Yukon XL 2500



6.0L V8 Gas OHV -- (Remanufactured)---
ARLINGTON,TX ASSEMBLY PLANT(ARL), SILAO,MEXICO PLANT(MSL), 145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U

1 Per Vehicle

2005

 

2005

 
GMC Yukon XL 2500

6.0L V8 Gas OHV,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
JANESVILLE,WI ASSEMBLY PLANT(JAN), 145 AMP(KG3)
 

GMC Yukon XL 2500



6.0L V8 Gas OHV,
8.1L V8 Gas OHV -- (Remanufactured)---
JANESVILLE,WI ASSEMBLY PLANT(JAN), 145 AMP(KG3)

1 Per Vehicle

2005

 

2005

 
GMC Yukon XL 2500

8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
ARLINGTON,TX ASSEMBLY PLANT(ARL), SILAO,MEXICO PLANT(MSL), 145 AMP(KG3)
Eng: L18
8th VIN Digit: G
 

GMC Yukon XL 2500



8.1L V8 Gas OHV -- (Remanufactured)---
ARLINGTON,TX ASSEMBLY PLANT(ARL), SILAO,MEXICO PLANT(MSL), 145 AMP(KG3)
Eng: L18
8th VIN Digit: G

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
GMC Yukon XL 2500

6.0L V8 Gas OHV,
8.1L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)
 

GMC Yukon XL 2500



6.0L V8 Gas OHV,
8.1L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3), SEO 145 AMP GEN(8C6)

1 Per Vehicle

2007

 

2007

 
Hummer H2

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
 

Hummer H2



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)

1 Per Vehicle

2006

 

2006

 
Hummer H2

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Crew Cab Pickup
 

Hummer H2



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Crew Cab Pickup

1 Per Vehicle

2006

 

2006

 
Hummer H2

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Sport Utility
 

Hummer H2



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Sport Utility

1 Per Vehicle

2005

 

2005

 
Hummer H2

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U
Crew Cab Pickup
 

Hummer H2



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U
Crew Cab Pickup

1 Per Vehicle

2005

 

2005

 
Hummer H2

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U
Sport Utility
 

Hummer H2



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U
Sport Utility

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
Hummer H2

6.0L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U
 

Hummer H2



6.0L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Eng: LQ4
8th VIN Digit: U

1 Per Vehicle

2005

 

2005

 
Isuzu Ascender

5.3L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Eng: LH6
8th VIN Digit: M
 

Isuzu Ascender



5.3L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Eng: LH6
8th VIN Digit: M

1 Per Vehicle

2004

 

2003

 

2004

 

2003

 
Isuzu Ascender

5.3L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Eng: LM4
8th VIN Digit: P
 

Isuzu Ascender



5.3L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Eng: LM4
8th VIN Digit: P

1 Per Vehicle

2005

 

2005

 
Saab 9-7x

5.3L V8 Gas OHV
1
 
-- (Remanufactured)---
145 AMP(KG3)
Eng: LH6
8th VIN Digit: M
 

Saab 9-7x



5.3L V8 Gas OHV -- (Remanufactured)---
145 AMP(KG3)
Eng: LH6
8th VIN Digit: M

1 Per Vehicle