Alternator for Cadillac, Chevrolet, GMC 400-12139
Alternator for Cadillac, Chevrolet, GMC 400-12139
Alternator for Cadillac, Chevrolet, GMC 400-12139
Alternator for Cadillac, Chevrolet, GMC 400-12139
Alternator for Cadillac, Chevrolet, GMC 400-12139
Alternator for Cadillac, Chevrolet, GMC 400-12139
Alternator for Cadillac, Chevrolet, GMC 400-12139

Alternator for Cadillac, Chevrolet, GMC 400-12139

Item #: 400-12139

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Highly engineered alternators for Cadillac, Chevrolet and GMC,
  • 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 for Chevrolet and other GM Vehicles
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. (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: 400-12139

100% Brand New Aftermarket Part From DB Electrical

Product Specs

Item ConditionAftermarket Part
Unit TypeAlternator
Voltage12
RotationCW
Amperage105
Clock11
Pulley Class1272
RegulatorIR
Fan TypeIF
FitsCHEVROLET / GMC 2000-02 ,6-GROOVE PULLEY 57mm OD ,DELCO AD230 SERIES

Applications List

Select Make & Type
MAKE TYPE MODEL YEAR ENGINE
CADILLACAuto and Light TruckESCALADE20025.3L(325) V8
CADILLACAuto and Light TruckESCALADE20026.0L(364) 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 EXT20026.0L(364) V8
CADILLACAuto and Light TruckESCALADE EXT20036.0L(364) V8
CADILLACAuto and Light TruckESCALADE EXT20046.0L(364) V8
CHEVROLETAuto and Light TruckASTRO VAN20014.3L(262) V6
CHEVROLETAuto and Light TruckASTRO VAN20024.3L(262) V6
CHEVROLETAuto and Light TruckASTRO VAN20034.3L(262) V6
CHEVROLETAuto and Light TruckASTRO VAN20044.3L(262) V6
CHEVROLETAuto and Light TruckAVALANCHE 150020025.3L(325) V8
CHEVROLETAuto and Light TruckAVALANCHE 150020035.3L(325) V8
CHEVROLETAuto and Light TruckAVALANCHE 150020045.3L(325) V8
CHEVROLETAuto and Light TruckAVALANCHE 250020028.1L(496) V8
CHEVROLETAuto and Light TruckAVALANCHE 250020038.1L(496) V8
CHEVROLETAuto and Light TruckAVALANCHE 250020048.1L(496) V8
CHEVROLETAuto and Light TruckC / K / R / V SERIES PICKUPS20018.1L(496) V8
CHEVROLETAuto and Light TruckC / K / R / V SERIES PICKUPS20028.1L(496) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20014.3L(262) V6
CHEVROLETAuto and Light TruckEXPRESS VANS20015.0L(305) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20015.7L(350) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20016.5L(395) V8 (Diesel)
CHEVROLETAuto and Light TruckEXPRESS VANS20018.1L(496) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20024.3L(262) V6
CHEVROLETAuto and Light TruckEXPRESS VANS20025.0L(305) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20025.7L(350) V8
CHEVROLETAuto and Light TruckEXPRESS VANS20026.5L(395) V8 (Diesel)
CHEVROLETAuto and Light TruckEXPRESS VANS20028.1L(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 150020004.3L(262) V6
CHEVROLETAuto and Light TruckSILVERADO 150020004.8L(294) V8
CHEVROLETAuto and Light TruckSILVERADO 150020005.3L(325) V8
CHEVROLETAuto and Light TruckSILVERADO 150020014.3L(262) V6
CHEVROLETAuto and Light TruckSILVERADO 150020014.8L(294) V8
CHEVROLETAuto and Light TruckSILVERADO 150020015.3L(325) V8
CHEVROLETAuto and Light TruckSILVERADO 150020024.3L(262) V6
CHEVROLETAuto and Light TruckSILVERADO 150020024.8L(294) V8
CHEVROLETAuto and Light TruckSILVERADO 150020025.3L(325) 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 HD20016.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 1500 HD20026.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 1500 HD20036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 1500 HD20056.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020005.3L(325) V8
CHEVROLETAuto and Light TruckSILVERADO 250020006.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020016.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020026.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020036.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 250020046.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20016.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20016.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20018.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20026.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20026.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 2500 HD20028.1L(496) 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 350020016.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 350020016.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 350020018.1L(496) V8
CHEVROLETAuto and Light TruckSILVERADO 350020026.0L(364) V8
CHEVROLETAuto and Light TruckSILVERADO 350020026.6L(403) V8 (Diesel)
CHEVROLETAuto and Light TruckSILVERADO 350020028.1L(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 TruckSUBURBAN20006.0L(364) V8
CHEVROLETAuto and Light TruckSUBURBAN20016.0L(364) V8
CHEVROLETAuto and Light TruckSUBURBAN20026.0L(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 TruckSUBURBAN20058.1L(496) V8
CHEVROLETAuto and Light TruckTAHOE20004.8L(294) V8
CHEVROLETAuto and Light TruckTAHOE20005.3L(325) V8
CHEVROLETAuto and Light TruckTAHOE20014.8L(294) V8
CHEVROLETAuto and Light TruckTAHOE20015.3L(325) V8
CHEVROLETAuto and Light TruckTAHOE20024.8L(294) V8
CHEVROLETAuto and Light TruckTAHOE20025.3L(325) 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
CHEVROLET / GMCMedium & Heavy-Duty TrucksAll Models (By Engine) - Diesel2001GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TrucksAll Models (By Engine) - Diesel2002GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TrucksAll Models (By Engine) - Diesel2003GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TrucksAll Models (By Engine) - Diesel2004GM 6.6L(400) V8 Dsl
CHEVROLET / GMCMedium & Heavy-Duty TrucksAll Models (By Engine) - Diesel2005GM 6.6L(400) V8 Dsl
GMCAuto and Light TruckC / K / R / V SERIES PICKUPS20018.1L(496) V8
GMCAuto and Light TruckC / K / R / V SERIES PICKUPS20028.1L(496) V8
GMCAuto and Light TruckSAFARI VAN20014.3L(262) V6
GMCAuto and Light TruckSAFARI VAN20024.3L(262) V6
GMCAuto and Light TruckSAFARI VAN20034.3L(262) V6
GMCAuto and Light TruckSAFARI VAN20044.3L(262) V6
GMCAuto and Light TruckSAVANA VANS20014.3L(262) V6
GMCAuto and Light TruckSAVANA VANS20015.0L(305) V8
GMCAuto and Light TruckSAVANA VANS20015.7L(350) V8
GMCAuto and Light TruckSAVANA VANS20016.5L(395) V8 (Diesel)
GMCAuto and Light TruckSAVANA VANS20018.1L(496) V8
GMCAuto and Light TruckSAVANA VANS20024.3L(262) V6
GMCAuto and Light TruckSAVANA VANS20025.0L(305) V8
GMCAuto and Light TruckSAVANA VANS20025.7L(350) V8
GMCAuto and Light TruckSAVANA VANS20026.5L(395) V8 (Diesel)
GMCAuto and Light TruckSAVANA VANS20028.1L(496) 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 150020004.3L(262) V6
GMCAuto and Light TruckSIERRA 150020004.8L(294) V8
GMCAuto and Light TruckSIERRA 150020005.3L(325) V8
GMCAuto and Light TruckSIERRA 150020014.3L(262) V6
GMCAuto and Light TruckSIERRA 150020014.8L(294) V8
GMCAuto and Light TruckSIERRA 150020015.3L(325) V8
GMCAuto and Light TruckSIERRA 150020024.3L(262) V6
GMCAuto and Light TruckSIERRA 150020024.8L(294) V8
GMCAuto and Light TruckSIERRA 150020025.3L(325) 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 HD20016.0L(364) V8
GMCAuto and Light TruckSIERRA 1500 HD20026.0L(364) V8
GMCAuto and Light TruckSIERRA 1500 HD20036.0L(364) V8
GMCAuto and Light TruckSIERRA 1500 HD20056.0L(364) V8
GMCAuto and Light TruckSIERRA 250020005.3L(325) V8
GMCAuto and Light TruckSIERRA 250020006.0L(364) V8
GMCAuto and Light TruckSIERRA 250020016.0L(364) V8
GMCAuto and Light TruckSIERRA 250020026.0L(364) V8
GMCAuto and Light TruckSIERRA 250020036.0L(364) V8
GMCAuto and Light TruckSIERRA 250020046.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20016.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20016.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 2500 HD20018.1L(496) V8
GMCAuto and Light TruckSIERRA 2500 HD20026.0L(364) V8
GMCAuto and Light TruckSIERRA 2500 HD20026.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 2500 HD20028.1L(496) 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 350020016.0L(364) V8
GMCAuto and Light TruckSIERRA 350020016.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 350020018.1L(496) V8
GMCAuto and Light TruckSIERRA 350020026.0L(364) V8
GMCAuto and Light TruckSIERRA 350020026.6L(403) V8 (Diesel)
GMCAuto and Light TruckSIERRA 350020028.1L(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 DENALI20026.0L(364) 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 TruckYUKON20004.8L(294) V8
GMCAuto and Light TruckYUKON20005.3L(325) V8
GMCAuto and Light TruckYUKON20014.8L(294) V8
GMCAuto and Light TruckYUKON20015.3L(325) V8
GMCAuto and Light TruckYUKON20016.0L(364) V8
GMCAuto and Light TruckYUKON20024.8L(294) V8
GMCAuto and Light TruckYUKON20025.3L(325) V8
GMCAuto and Light TruckYUKON20026.0L(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 TruckYUKON XL20006.0L(364) V8
GMCAuto and Light TruckYUKON XL20016.0L(364) V8
GMCAuto and Light TruckYUKON XL20026.0L(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 XL20058.1L(496) V8

Replaces These Part Numbers

AC DELCO321-1798, 321-1811, 321-1815, 321-1850, 334-2491, 334-2516, 334-2528
ACECA8229-3-14
ARROWHEADADR0319, ADR0358, ADR0215
BARSANCO110-8238, 110-8273
BBB HD8238, 8291
CARGO112850
DELCO10464455, 10464481, 10480326, 10480388, 10480476, 15755616, 15755616W, 15768829
DELCO REMAN10464438, 10464451
DIXIEA-1548
DIXIE NEWA-1548N
DUBOIS671388, 908291
FAMILYAD230
J&N Electrical Products400-12139
LESTER8247, 8273, 8291
MINNPAR47-1919, 47-1989
NAPA POWER PREMIUM PLUS213-4837, 213-4838
NSAALT-1506
NSAALT-1509
PIC240-6225, 240-6415A, 240-6415B, 240-6417
RCPAL-8247
REGITAR-USAA240-6415AN, A240-6417N
REMY LIGHT DUTY21798
REMY LIGHT DUTY NEW91602
UNIPOINTALT-1509
USA INDUSTRIES8247, 8291
WAGNER423016
WAI1-2320-21DR
WILSON90-01-4359, 90-01-4366, 90-01-4414, 90-01-4685, 90-01-4705
WILSON NEW90-01-4685, 90-01-4685N, 90-01-4705, 90-01-4705N

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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