Alternator for 4.3L, 4.8L Chevrolet Silverado Pickup 1500 2003-2005 400-12204
Alternator for 4.3L, 4.8L Chevrolet Silverado Pickup 1500 2003-2005 400-12204

Alternator for 4.3L, 4.8L Chevrolet Silverado Pickup 1500 2003-2005 400-12204

Item #: 400-12204

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Highly engineered alternators for Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu and Saab
  • Built to Beat the Heat: High temperature epoxy and high temperature grease withstand extreme heat
  • Heavy-duty rectifiers and high-quality regulators enhance superior charging performance
  • Most alternators are supplied with final test results and performance curve
  • Direct-fit replacement and easy installation made possible with OEM fitment specifications
  • Highly recommended as a Chevy Silverado alternator replacement, as well as for Buick Rainer, Cadillac Escalade, Chevrolet Avalanche, Chevrolet Suburban, Chevrolet Tahoe, Chevrolet Trailblazer, GMC Sierra, GMC Yukon and more
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  • Product Info
  • Applications List
  • Part Replacement List
  • Policy Information
  • Reviews

Overview

DB Electrical Alternators for Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu and Saab
DB Electrical offers premium-quality alternators that deliver high-performance for Chevrolet and other General Motors brands such as Buick, GMC, Pontiac and Oldsmobile. Owners of Chevy cars, trucks, vans and SUVs appreciate the highly engineered quality of DB Electrical alternators for flawless mechanical performance and longevity. Founded in 1911, Chevy has been a symbol of the American road for over a century. A DB Electrical alternator is a great choice for keeping your Chevrolet or other GM vehicle on the road. Highly recommended as a Chevy Silverado alternator replacement, as well as for Buick Rainer, Cadillac Escalade, Chevrolet Avalanche, Chevrolet Suburban, Chevrolet Tahoe, Chevrolet Trailblazer, GMC Sierra, GMC Yukon and more. (Check our applications table below for specific makes and models for this alternator.)

With DB Electrical alternators, you'll get -

  • Superior Quality Every Time - Our aftermarket alternators deliver performance that's equivalent to the original.
  • Direct-Fit OEM Replacement Parts - DB Electrical aftermarket alternators are designed for perfect fitment to replace the ones that originally came with your vehicle.
  • Engineer-Tested Excellence - Our alternators go through a rigorous testing program to ensure optimal performance. Most alternators are supplied with their final test results and performance curve.

Reasons to choose DB Electrical for your next alternator:

  • Built to Take the Heat - Most DB Electrical alternators offer high-temperature epoxy, heavy-duty rectifiers, high-quality regulators, top-quality bearings and high-temperature grease produce better charging and longer life under high-heat environments.
  • Brand New Alternator - Never settle for a secondhand one. Many places will try to sell you a used alternator for about the price we'll sell you a new one.

The DB Electrical Advantage - Factory-Direct Pricing and 1-Year Warranty
DB Electrical sells its exceptional-quality electrical components at low factory-direct prices. DB Electrical delivers exceptional value for products that we stand behind with our total-confidence 1-year warranty. Yes, you have a full year to make sure your alternator meets your expectations.

Item Number: 400-12204

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Item ConditionAftermarket Part
Unit TypeAlternator
Voltage12
RotationCW
Amperage145
Pulley ClassS6
RegulatorIR
Fan TypeIF
FitsBUICK RANIER 5.3L 2006
CHEVROLET / GMC LIGHT TRUCKS 2003-06
ISUZU ASCENDER 5.3L 2003-06
6-GROOVE PULLEY 57mm OD
DELCO AD244 SERIES

Applications List

Select Make & Type
MAKE TYPE MODEL YEAR ENGINE
BUICKAuto and Light TruckRAINIER20045.3L(325) V8
BUICKAuto and Light TruckRAINIER20055.3L(325) V8
BUICKAuto and Light TruckRAINIER20065.3L(325) V8
CADILLACAuto and Light TruckESCALADE20035.3L(325) V8
CADILLACAuto and Light TruckESCALADE20036.0L(364) V8
CADILLACAuto and Light TruckESCALADE20045.3L(325) V8
CADILLACAuto and Light TruckESCALADE20046.0L(364) V8
CADILLACAuto and Light TruckESCALADE ESV20036.0L(364) V8
CADILLACAuto and Light TruckESCALADE ESV20046.0L(364) V8
CADILLACAuto and Light TruckESCALADE EXT20036.0L(364) V8
CADILLACAuto and Light TruckESCALADE EXT20046.0L(364) V8
CHEVROLETAuto and Light TruckAVALANCHE 150020035.3L(325) V8
CHEVROLETAuto and Light TruckAVALANCHE 150020045.3L(325) V8
CHEVROLETAuto and Light TruckAVALANCHE 250020038.1L(496) V8
CHEVROLETAuto and Light TruckAVALANCHE 250020048.1L(496) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20034.3L(262) V6
CHEVROLETAuto and Light TruckEXPRESS VANS20034.8L(294) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20035.3L(323) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20036.0L(364) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20044.3L(262) V6
CHEVROLETAuto and Light TruckEXPRESS VANS20044.8L(294) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20045.3L(323) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20046.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 150020034.3L(262) V6
CHEVROLETAuto and Light TruckSILVERADO 150020034.8L(294) V8
CHEVROLETAuto and Light TruckSILVERADO 150020035.3L(325) V8
CHEVROLETAuto and Light TruckSILVERADO 150020036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 150020044.3L(262) V6
CHEVROLETAuto and Light TruckSILVERADO 150020044.8L(294) V8
CHEVROLETAuto and Light TruckSILVERADO 150020045.3L(325) V8
CHEVROLETAuto and Light TruckSILVERADO 150020046.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 150020056.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 1500 HD20036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 1500 HD20056.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020046.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20036.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20038.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20046.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20046.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20048.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20056.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20056.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20058.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 350020036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 350020036.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 350020038.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 350020046.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 350020046.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 350020048.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 350020056.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 350020056.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 350020058.1L(496) V8
CHEVROLETAuto and Light TruckSSR20035.3L(325) V8
CHEVROLETAuto and Light TruckSSR20045.3L(325) V8
CHEVROLETAuto and Light TruckSSR20056.0L(364) V8
CHEVROLETAuto and Light TruckSUBURBAN20035.3L(323) V8
CHEVROLETAuto and Light TruckSUBURBAN20036.0L(364) V8
CHEVROLETAuto and Light TruckSUBURBAN20038.1L(496) V8
CHEVROLETAuto and Light TruckSUBURBAN20045.3L(323) V8
CHEVROLETAuto and Light TruckSUBURBAN20046.0L(364) V8
CHEVROLETAuto and Light TruckSUBURBAN20048.1L(496) V8
CHEVROLETAuto and Light TruckSUBURBAN20056.0L(364) V8
CHEVROLETAuto and Light TruckSUBURBAN20058.1L(496) V8
CHEVROLETAuto and Light TruckTAHOE20034.8L(294) V8
CHEVROLETAuto and Light TruckTAHOE20035.3L(325) V8
CHEVROLETAuto and Light TruckTAHOE20044.8L(294) V8
CHEVROLETAuto and Light TruckTAHOE20045.3L(325) V8
CHEVROLETAuto and Light TruckTRAILBLAZER20035.3L(325) V8
CHEVROLETAuto and Light TruckTRAILBLAZER20045.3L(325) V8
CHEVROLETAuto and Light TruckTRAILBLAZER20055.3L(325) V8
CHEVROLETAuto and Light TruckTRAILBLAZER20065.3L(325) V8
CHEVROLET / GMCMedium & Heavy-Duty TruckAll Models (By Engine) - Diesel2003GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TruckAll Models (By Engine) - Diesel2004GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TruckAll Models (By Engine) - Diesel2005GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TruckW3500 Tiltmaster2003GM 6.0L(364) V8 Gas
CHEVROLET / GMCMedium & Heavy-Duty TruckW3500 Tiltmaster2004GM 6.0L(364) V8 Gas
CHEVROLET / GMCMedium & Heavy-Duty TruckW3500 Tiltmaster2005GM 6.0L(364) V8 Gas
CHEVROLET / GMCMedium & Heavy-Duty TruckW4500 Tiltmaster2003GM 6.0L(364) V8 Gas
CHEVROLET / GMCMedium & Heavy-Duty TruckW4500 Tiltmaster2004GM 6.0L(364) V8 Gas
CHEVROLET / GMCMedium & Heavy-Duty TruckW4500 Tiltmaster2005GM 6.0L(364) V8 Gas
GMCAuto and Light TruckENVOY20035.3L(325) V8
GMCAuto and Light TruckENVOY20045.3L(325) V8
GMCAuto and Light TruckENVOY20055.3L(325) V8
GMCAuto and Light TruckENVOY20065.3L(325) V8
GMCAuto and Light TruckSAVANA VANS20034.3L(262) V6
GMCAuto and Light TruckSAVANA VANS20034.8L(294) V8
GMCAuto and Light TruckSAVANA VANS20035.3L(323) V8
GMCAuto and Light TruckSAVANA VANS20036.0L(364) V8
GMCAuto and Light TruckSAVANA VANS20044.3L(262) V6
GMCAuto and Light TruckSAVANA VANS20044.8L(294) V8
GMCAuto and Light TruckSAVANA VANS20045.3L(323) V8
GMCAuto and Light TruckSAVANA VANS20046.0L(364) V8
GMCAuto and Light TruckSIERRA 150020034.3L(262) V6
GMCAuto and Light TruckSIERRA 150020034.8L(294) V8
GMCAuto and Light TruckSIERRA 150020035.3L(325) V8
GMCAuto and Light TruckSIERRA 150020044.3L(262) V6
GMCAuto and Light TruckSIERRA 150020044.8L(294) V8
GMCAuto and Light TruckSIERRA 150020045.3L(325) V8
GMCAuto and Light TruckSIERRA 1500 HD20036.0L(364) V8
GMCAuto and Light TruckSIERRA 1500 HD20056.0L(364) V8
GMCAuto and Light TruckSIERRA 250020036.0L(364) V8
GMCAuto and Light TruckSIERRA 250020046.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20036.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20036.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 2500 HD20038.1L(496) V8
GMCAuto and Light TruckSIERRA 2500 HD20046.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20046.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 2500 HD20048.1L(496) V8
GMCAuto and Light TruckSIERRA 2500 HD20056.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20056.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 2500 HD20058.1L(496) V8
GMCAuto and Light TruckSIERRA 350020036.0L(364) V8
GMCAuto and Light TruckSIERRA 350020036.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 350020038.1L(496) V8
GMCAuto and Light TruckSIERRA 350020046.0L(364) V8
GMCAuto and Light TruckSIERRA 350020046.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 350020048.1L(496) V8
GMCAuto and Light TruckSIERRA 350020056.0L(364) V8
GMCAuto and Light TruckSIERRA 350020056.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 350020058.1L(496) V8
GMCAuto and Light TruckSIERRA DENALI20036.0L(364) V8
GMCAuto and Light TruckSIERRA DENALI20046.0L(364) V8
GMCAuto and Light TruckSIERRA DENALI20056.0L(364) V8
GMCAuto and Light TruckYUKON20034.8L(294) V8
GMCAuto and Light TruckYUKON20035.3L(325) V8
GMCAuto and Light TruckYUKON20036.0L(364) V8
GMCAuto and Light TruckYUKON20044.8L(294) V8
GMCAuto and Light TruckYUKON20045.3L(325) V8
GMCAuto and Light TruckYUKON20046.0L(364) V8
GMCAuto and Light TruckYUKON20056.0L(364) V8
GMCAuto and Light TruckYUKON XL20035.3L(325) V8
GMCAuto and Light TruckYUKON XL20036.0L(364) V8
GMCAuto and Light TruckYUKON XL20038.1L(496) V8
GMCAuto and Light TruckYUKON XL20045.3L(325) V8
GMCAuto and Light TruckYUKON XL20046.0L(364) V8
GMCAuto and Light TruckYUKON XL20048.1L(496) V8
GMCAuto and Light TruckYUKON XL20056.0L(364) V8
GMCAuto and Light TruckYUKON XL20058.1L(496) V8
HUMMERAuto and Light TruckH220036.0L(364) V8
HUMMERAuto and Light TruckH220046.0L(364) V8
HUMMERAuto and Light TruckH220056.0L(364) V8
ISUZUAuto and Light TruckASCENDER20035.3L(325) V8
ISUZUAuto and Light TruckASCENDER20045.3L(325) V8
ISUZUAuto and Light TruckASCENDER20055.3L(325) V8
ISUZUAuto and Light TruckASCENDER20065.3L(325) V8
ISUZUMedium-Duty TrucksNPR2003GM 6.0L(364) V8
ISUZUMedium-Duty TrucksNPR2004GM 6.0L(364) V8
ISUZUMedium-Duty TrucksNPR2005GM 6.0L(364) V8
ISUZUMedium-Duty TrucksNPR-HD2003GM 6.0L(364) V8
ISUZUMedium-Duty TrucksNPR-HD2004GM 6.0L(364) V8
ISUZUMedium-Duty TrucksNPR-HD2005GM 6.0L(364) V8
SAABAuto and Light Truck9-7X20055.3L
SAABAuto and Light Truck9-7X20065.3L

Replaces These Part Numbers

AC DELCO321-1845, 321-2128, 334-2529
ARROWHEADADR0290, 400-12204
CARGO113777
DELCO10464476, 15226003, 15754097, 15754097A, 15754097M, 15754097W, 8400042
GENERAL MOTORS19151921, 19244751
ISUZU8104644760, 8152260030, 8192447510
J&N Electrical Products400-12204
LESTER8292
NSAALT-1511
REGITAR-USAA240-6223N
REMY LIGHT DUTY21845
SAAB15-22-6003
UNIPOINTALT-1511
WAI1-2419-21DR, 8292N

Frequently Asked Questions

Q: Do I need a larger charge wire for a High Output unit?
A: The high amp unit will operate better than stock, but not to its full potential without a larger charge wire. It’s the same reason firetrucks do not use garden hoses. It is IMPARATIVE to have proper charge and ground cables.

Q: Does a High Amp unit cause any damage to my battery or my vehicles charging system?
A: As long as it is installed properly with battery in good condition, then no. A High Output unit works exactly like a factory unit and only produces what is being demanded. No alternator works continuously at full output. Higher amperage is not bad and will not hurt a battery, but high voltage will blow one up.

Q: Will aftermarket underdrive pulleys (crankshaft power pulley) have any effect on my alternator?
A: Yes, underdrive crankshaft pulleys slow all the components (power steering, a/c, and alternator) to provide more power to the rear wheels. In some cases, the charging systems will fall totally on the battery at idle and completely stop charging.

Q: Where is the best place to get a voltage reading of the alternator output?
A: You’ll get the most accurate voltage reading from the back of the alternator at the main charge post that runs directly to the battery. This must be done while the vehicle is running.

Q: Why is the pulley on a high amp alternator smaller than my stock pulley?
A: The smaller pulley advances the power curve of the alternator just slightly, which produces a little more amperage around the idle if needed.

Q: Will I need a smaller belt for my high amp unit?
A: This varies by application because not all belts and belt tensioners are in the same condition. The tensioner will always tell you if you need a new belt or not. If it’s in range, you will not. If it is out, you will. Generally, you will need a belt that is one inch shorter than stock. You should have no problem finding a replacement wherever you buy your parts. V belt applications simply re-adjust your belt tensions to 3/8” deflection.

Q: What is the difference between a one wire, self-exciting and a self-energizing regulator?
A: Nothing. They are all exactly the same. Different manufacturers use different terms for marketing. The only wire to hook up is the charge wire to the battery. This does require modification for the alternator charge light on the dash.

Q: My stock unit used a five-groove pulley, and you sent my high amp alternator with a 6 groove. Why and what can I do?
A: 5 groove overdrive pullies are not produced. Install the belt on the back groove of the pulley closest to the fan or body of the alternator. The fan is internal, and this application will work just fine.

Q: Can your alternator be run in dual or triple alternator applications?
A: Yes. When wired and mounted correctly, the alternator can run in either dual or triple applications.

Q: Will I need a new battery with a high amp alternator?
A: If your battery is in good condition, and in spec of its OEM rating, then no. Your battery should work equally well with either the OEM and a High Amp unit.

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