400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO
400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO
400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO
400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO
400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO
400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO
400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO

400-12478 Alternator for Buick Rainier 2004-2006 AD244 HO

Item #: 400-12478

30-DAY RETURN POLICY

If your order arrives and it’s not exactly what you want, you may return it within 30 days for a refund. We know that people sometimes order a part and then discover it’s not exactly the one they need for the repair. We understand and want to work with you. Just make sure the item is in its original packaging and in good condition free of damage.

When a returned product comes back to us, we’ll check it over to make sure it’s in ‘Like New’ condition and free from damage such as dents, scratches, cracks, abuse, defacement or indication of removed screws/fasteners or seals. Return processing may take up to 5 business days from the time your product is received by DB Electrical.

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DB Electrical alternators are highly engineered for excellence in performance.
  • 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
  • Factory direct, money-saving alternator typically priced substantially less than OEM counterparts
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  • Product Info
  • Applications List
  • Part Replacement List
  • Policy Information
  • Reviews

Overview

DB Electrical Alternators
DB Electrical keeps vehicles of every shape and size moving forward – from mowers, motorcycles and ATVs to automobiles, tractors, pickups and large commercial trucks. We work directly with factories to ensure each component is manufactured to our exacting quality control standards. But because there is no middleman, we can offer these exceptional-quality electrical components at low factory direct prices.

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 for better charging and longer life under high-heat environments.
  • Depth of Inventory – Find both common and hard-to-find alternators for virtually any type of vehicle to travel over road, trail or water.
  • 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 – 1-Year Warranty
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: 400-12478

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Item ConditionAftermarket Part
Unit TypeAlternator
Voltage12
RotationCW
Amperage250
Clock12
Pulley ClassS6
RegulatorIR
Fan TypeIF

Applications List

Select Make & Type
MAKE TYPE MODEL YEAR ENGINE
BUICKMedium & Heavy-Duty TruckRAINIER20045.3L(325) V8
BUICKMedium & Heavy-Duty TruckRAINIER20055.3L(325) V8
BUICKMedium & Heavy-Duty TruckRAINIER20065.3L(325) V8
CADILLACMedium & Heavy-Duty TruckESCALADE ESV20036.0L(364) V8
CADILLACMedium & Heavy-Duty TruckESCALADE ESV20046.0L(364) V8
CADILLACMedium & Heavy-Duty TruckESCALADE EXT20036.0L(364) V8
CADILLACMedium & Heavy-Duty TruckESCALADE EXT20046.0L(364) V8
CADILLACMedium & Heavy-Duty TruckESCALADE20035.3L(325) V8
CADILLACMedium & Heavy-Duty TruckESCALADE20036.0L(364) V8
CADILLACMedium & Heavy-Duty TruckESCALADE20045.3L(325) V8
CADILLACMedium & Heavy-Duty TruckESCALADE20046.0L(364) 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
CHEVROLETMedium & Heavy-Duty TruckAVALANCHE 150020035.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckAVALANCHE 150020045.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckAVALANCHE 250020038.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckAVALANCHE 250020048.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20034.3L(262) V6
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20034.8L(294) V8
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20035.3L(323) V8
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20044.3L(262) V6
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20044.8L(294) V8
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20045.3L(323) V8
CHEVROLETMedium & Heavy-Duty TruckEXPRESS VANS20046.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 1500 HD20036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 1500 HD20056.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020034.3L(262) V6
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020034.8L(294) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020035.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020044.3L(262) V6
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020044.8L(294) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020045.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020046.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 150020056.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20036.6L(403) V8 (Diesel)
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20038.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20046.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20046.6L(403) V8 (Diesel)
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20048.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20056.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20056.6L(403) V8 (Diesel)
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 2500 HD20058.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 250020036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 250020046.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020036.6L(403) V8 (Diesel)
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020038.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020046.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020046.6L(403) V8 (Diesel)
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020048.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020056.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020056.6L(403) V8 (Diesel)
CHEVROLETMedium & Heavy-Duty TruckSILVERADO 350020058.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSSR20035.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckSSR20045.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckSSR20056.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20035.3L(323) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20036.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20038.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20045.3L(323) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20046.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20048.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20056.0L(364) V8
CHEVROLETMedium & Heavy-Duty TruckSUBURBAN20058.1L(496) V8
CHEVROLETMedium & Heavy-Duty TruckTAHOE20034.8L(294) V8
CHEVROLETMedium & Heavy-Duty TruckTAHOE20035.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckTAHOE20044.8L(294) V8
CHEVROLETMedium & Heavy-Duty TruckTAHOE20045.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckTRAILBLAZER20035.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckTRAILBLAZER20045.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckTRAILBLAZER20055.3L(325) V8
CHEVROLETMedium & Heavy-Duty TruckTRAILBLAZER20065.3L(325) V8
GMCMedium & Heavy-Duty TruckENVOY20035.3L(325) V8
GMCMedium & Heavy-Duty TruckENVOY20045.3L(325) V8
GMCMedium & Heavy-Duty TruckENVOY20055.3L(325) V8
GMCMedium & Heavy-Duty TruckENVOY20065.3L(325) V8
GMCMedium & Heavy-Duty TruckSAVANA VANS20034.3L(262) V6
GMCMedium & Heavy-Duty TruckSAVANA VANS20034.8L(294) V8
GMCMedium & Heavy-Duty TruckSAVANA VANS20035.3L(323) V8
GMCMedium & Heavy-Duty TruckSAVANA VANS20036.0L(364) V8
GMCMedium & Heavy-Duty TruckSAVANA VANS20044.3L(262) V6
GMCMedium & Heavy-Duty TruckSAVANA VANS20044.8L(294) V8
GMCMedium & Heavy-Duty TruckSAVANA VANS20045.3L(323) V8
GMCMedium & Heavy-Duty TruckSAVANA VANS20046.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 1500 HD20036.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 1500 HD20056.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 150020034.3L(262) V6
GMCMedium & Heavy-Duty TruckSIERRA 150020034.8L(294) V8
GMCMedium & Heavy-Duty TruckSIERRA 150020035.3L(325) V8
GMCMedium & Heavy-Duty TruckSIERRA 150020044.3L(262) V6
GMCMedium & Heavy-Duty TruckSIERRA 150020044.8L(294) V8
GMCMedium & Heavy-Duty TruckSIERRA 150020045.3L(325) V8
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20036.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20036.6L(403) V8 (Diesel)
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20038.1L(496) V8
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20046.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20046.6L(403) V8 (Diesel)
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20048.1L(496) V8
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20056.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20056.6L(403) V8 (Diesel)
GMCMedium & Heavy-Duty TruckSIERRA 2500 HD20058.1L(496) V8
GMCMedium & Heavy-Duty TruckSIERRA 250020036.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 250020046.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 350020036.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 350020036.6L(403) V8 (Diesel)
GMCMedium & Heavy-Duty TruckSIERRA 350020038.1L(496) V8
GMCMedium & Heavy-Duty TruckSIERRA 350020046.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 350020046.6L(403) V8 (Diesel)
GMCMedium & Heavy-Duty TruckSIERRA 350020048.1L(496) V8
GMCMedium & Heavy-Duty TruckSIERRA 350020056.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA 350020056.6L(403) V8 (Diesel)
GMCMedium & Heavy-Duty TruckSIERRA 350020058.1L(496) V8
GMCMedium & Heavy-Duty TruckSIERRA DENALI20036.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA DENALI20046.0L(364) V8
GMCMedium & Heavy-Duty TruckSIERRA DENALI20056.0L(364) V8
GMCMedium & Heavy-Duty TruckYUKON XL20035.3L(325) V8
GMCMedium & Heavy-Duty TruckYUKON XL20036.0L(364) V8
GMCMedium & Heavy-Duty TruckYUKON XL20038.1L(496) V8
GMCMedium & Heavy-Duty TruckYUKON XL20045.3L(325) V8
GMCMedium & Heavy-Duty TruckYUKON XL20046.0L(364) V8
GMCMedium & Heavy-Duty TruckYUKON XL20048.1L(496) V8
GMCMedium & Heavy-Duty TruckYUKON XL20056.0L(364) V8
GMCMedium & Heavy-Duty TruckYUKON XL20058.1L(496) V8
GMCMedium & Heavy-Duty TruckYUKON20034.8L(294) V8
GMCMedium & Heavy-Duty TruckYUKON20035.3L(325) V8
GMCMedium & Heavy-Duty TruckYUKON20036.0L(364) V8
GMCMedium & Heavy-Duty TruckYUKON20044.8L(294) V8
GMCMedium & Heavy-Duty TruckYUKON20045.3L(325) V8
GMCMedium & Heavy-Duty TruckYUKON20046.0L(364) V8
GMCMedium & Heavy-Duty TruckYUKON20056.0L(364) V8
HUMMERMedium & Heavy-Duty TruckH220036.0L(364) V8
HUMMERMedium & Heavy-Duty TruckH220046.0L(364) V8
HUMMERMedium & Heavy-Duty TruckH220056.0L(364) V8
ISUZUMedium & Heavy-Duty TruckASCENDER20035.3L(325) V8
ISUZUMedium & Heavy-Duty TruckASCENDER20045.3L(325) V8
ISUZUMedium & Heavy-Duty TruckASCENDER20055.3L(325) V8
ISUZUMedium & Heavy-Duty TruckASCENDER20065.3L(325) V8
ISUZUMedium & Heavy-Duty TruckNPR2003GM 6.0L(364) V8
ISUZUMedium & Heavy-Duty TruckNPR2004GM 6.0L(364) V8
ISUZUMedium & Heavy-Duty TruckNPR2005GM 6.0L(364) V8
ISUZUMedium & Heavy-Duty TruckNPR-HD2003GM 6.0L(364) V8
ISUZUMedium & Heavy-Duty TruckNPR-HD2004GM 6.0L(364) V8
ISUZUMedium & Heavy-Duty TruckNPR-HD2005GM 6.0L(364) V8
SAABMedium & Heavy-Duty Truck9-7X20055.3L
SAABMedium & Heavy-Duty Truck9-7X20065.3L

Replaces These Part Numbers

ARROWHEAD400-12478
FAMILYAD244 HO
J&N Electrical Products400-12478

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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