2003 - 2006 GMC Sierra high output Alternator

Available in: 400a, 370a, 350a, 320a, 240a

• Buick     Rainier  2004 - 2006          V8 5.3L 5328CC 325CID
• Cadillac Escalade               2003 - 2004          V8 5.3L 5328CC 325CID
• Cadillac Escalade               2003 - 2004          V8 6.0L 5967CC 364CID
• Cadillac Escalade ESV      2003 - 2004          V8 6.0L 5967CC 364CID
• Cadillac Escalade EXT      2003 - 2004          V8 6.0L 5967CC 364CID
• Chevrolet            C3500HD              2001 - 2005          V8 8.1L 496CID
• Chevrolet            Express 4500      2009       V8 6.0L 5967CC 364CID
• Chevrolet            Express 4500      2009 - 2016          V8 6.6L 6599CC 403CID
• Chevrolet            Avalanche 1500 2003 - 2004          V8 5.3L 5328CC 325CID
• Chevrolet            Avalanche 1500 2004       V8 5.3L 5328CC 325CID
• Chevrolet            Avalanche 2500 2003 - 2006          V8 8.1L 496CID
• Chevrolet            Silverado 1500   2003 - 2005          V8 5.3L 5328CC 325CID
• Chevrolet            Silverado 1500   2003 - 2004          V6 4.3L 262CID
• Chevrolet            Silverado 1500   2003 - 2004          V8 4.8L 294CID
• Chevrolet            Silverado 1500   2006       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 1500   2003 - 2004          V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 1500   2003 - 2004          V8 5.3L 5328CC 325CID
• Chevrolet            Silverado 1500   2004       V6 4.3L 262CID
• Chevrolet            Silverado 1500   2004       V8 4.8L 294CID
• Chevrolet            Silverado 1500   2004       V8 5.3L 5328CC 325CID
• Chevrolet            Silverado 1500 Classic     2007       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 1500 HD            2005 - 2006          V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 1500 HD            2003       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 2500   2003 - 2004          V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 2500 HD            2003 - 2005          V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 2500 HD            2003 - 2005          V8 6.6L 6599CC 403CID
• Chevrolet            Silverado 2500 HD            2003 - 2006          V8 8.1L 496CID
• Chevrolet            Silverado 2500 HD            2003 - 2006          V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 2500 HD            2004       V8 6.6L 6599CC 403CID
• Chevrolet            Silverado 2500 HD            2004 - 2005          V8 8.1L 496CID
• Chevrolet            Silverado 2500 HD Classic              2007       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 2500 HD Classic              2007       V8 8.1L 496CID
• Chevrolet            Silverado 3500   2003 - 2005          V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 3500   2003 - 2005          V8 6.6L 6599CC 403CID
• Chevrolet            Silverado 3500   2003 - 2005          V8 8.1L 496CID
• Chevrolet            Silverado 3500   2006       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 3500   2006       V8 8.1L 496CID
• Chevrolet            Silverado 3500   2004       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 3500   2004       V8 6.6L 6599CC 403CID
• Chevrolet            Silverado 3500   2004       V8 8.1L 496CID
• Chevrolet            Silverado 3500 Classic     2007       V8 6.0L 5967CC 364CID
• Chevrolet            Silverado 3500 Classic     2007       V8 8.1L 496CID
• Chevrolet            SSR         2003 - 2004          V8 5.3L 5328CC 325CID
• Chevrolet            SSR         2005 - 2006          V8 6.0L 5967CC 364CID
• Chevrolet            Suburban 1500  2003 - 2004          V8 5.3L 5328CC 325CID
• Chevrolet            Suburban 1500  2006       V8 6.0L 5967CC 364CID
• Chevrolet            Suburban 2500  2003 - 2006          V8 6.0L 5967CC 364CID
• Chevrolet            Suburban 2500  2003 - 2006          V8 8.1L 496CID
• Chevrolet            Tahoe   2003 - 2004          V8 4.8L 294CID
• Chevrolet            Tahoe   2003 - 2004          V8 5.3L 5328CC 325CID
• Chevrolet            TRailblazer          2006       V8 5.3L 5328CC 325CID
• Chevrolet            TRailblazer EXT  2003 - 2006          V8 5.3L 5328CC 325CID
• Chevrolet            Express 1500      2007 - 2008          V6 4.3L 262CID
• Chevrolet            Express 1500      2008 - 2009          V8 5.3L 5328CC 325CID
• Chevrolet            Express 1500      2003 - 2004          V6 4.3L 262CID
• Chevrolet            Express 1500      2003 - 2004          V8 5.3L 5328CC 325CID
• Chevrolet            Express 1500      2006       V6 4.3L 262CID
• Chevrolet            Express 1500      2006 - 2009          V8 5.3L 5328CC 325CID
• Chevrolet            Express 2500      2006 - 2011          V8 4.8L 294CID
• Chevrolet            Express 2500      2008 - 2011          V8 6.0L 5967CC 364CID
• Chevrolet            Express 2500      2006 - 2016          V8 6.6L 6599CC 403CID
• Chevrolet            Express 2500      2003 - 2005          V6 4.3L 262CID
• Chevrolet            Express 2500      2003 - 2006          V8 4.8L 294CID
• Chevrolet            Express 2500      2003 - 2005          V8 5.3L 5328CC 325CID
• Chevrolet            Express 2500      2003 - 2011          V8 6.0L 5967CC 364CID
• Chevrolet            Express 3500      2004 - 2011          V8 4.8L 294CID
• Chevrolet            Express 3500      2008 - 2011          V8 6.0L 5967CC 364CID
• Chevrolet            Express 3500      2006 - 2016          V8 6.6L 6599CC 403CID
• Chevrolet            Express 3500      2003 - 2011          V8 6.0L 5967CC 364CID
• Chevrolet            Express 3500      2004 - 2005          V8 4.8L 294CID
• Chevrolet            Express 3500      2006 - 2011          V8 6.0L 5967CC 364CID
• GMC      C3500HD              2001 - 2002          V8 8.1L 496CID
• GMC      Savana 4500       2009       V8 6.0L 5967CC 364CID
• GMC      Savana 4500       2009 - 2016          V8 6.6L 6599CC 403CID
• GMC      Envoy    2005 - 2006          V8 5.3L 5328CC 325CID
• GMC      Envoy XL              2003 - 2006          V8 5.3L 5328CC 325CID
• GMC      Envoy XUV          2004 - 2005          V8 5.3L 5328CC 325CID
• GMC      Sierra 1500          2003 - 2004          V6 4.3L 262CID
• GMC      Sierra 1500          2003 - 2004          V8 4.8L 294CID
• GMC      Sierra 1500          2003 - 2005          V8 5.3L 5328CC 325CID
• GMC      Sierra 1500          2003 - 2004          V8 6.0L 5967CC 364CID
• GMC      Sierra 1500          2003       V6 4.3L 262CID
• GMC      Sierra 1500          2003       V8 4.8L 294CID
• GMC      Sierra 1500          2006       V8 6.0L 5967CC 364CID
• GMC      Sierra 1500 Classic            2007       V8 6.0L 5967CC 364CID
• GMC      Sierra 1500 HD   2003       V8 6.0L 5967CC 364CID
• GMC      Sierra 1500 HD   2005 - 2006          V8 6.0L 5967CC 364CID
• GMC      Sierra 2500          2003 - 2004          V8 6.0L 5967CC 364CID
• GMC      Sierra 2500 HD   2003 - 2006          V8 6.0L 5967CC 364CID
• GMC      Sierra 2500 HD   2003 - 2005          V8 6.6L 6599CC 403CID
• GMC      Sierra 2500 HD   2003 - 2006          V8 8.1L 496CID
• GMC      Sierra 2500 HD Classic     2007       V8 6.0L 5967CC 364CID
• GMC      Sierra 2500 HD Classic     2007       V8 8.1L 496CID
• GMC      Sierra 3500          2003 - 2005          V8 6.0L 5967CC 364CID
• GMC      Sierra 3500          2003 - 2004          V8 6.6L 6599CC 403CID
• GMC      Sierra 3500          2003 - 2005          V8 8.1L 496CID
• GMC      Sierra 3500          2004 - 2005          V8 6.0L 5967CC 364CID
• GMC      Sierra 3500          2004 - 2005          V8 6.6L 6599CC 403CID
• GMC      Sierra 3500          2004 - 2006          V8 6.0L 5967CC 364CID
• GMC      Sierra 3500          2004 - 2006          V8 8.1L 496CID
• GMC      Sierra 3500 Classic            2007       V8 6.0L 5967CC 364CID
• GMC      Sierra 3500 Classic            2007       V8 8.1L 496CID
• GMC      Yukon   2003 - 2004          V8 6.0L 5967CC 364CID
• GMC      Yukon   2003 - 2004          V8 4.8L 294CID
• GMC      Yukon   2003 - 2004          V8 5.3L 5328CC 325CID
• GMC      Yukon XL 1500   2003 - 2004          V8 6.0L 5967CC 364CID
• GMC      Yukon XL 1500   2003 – 2004         V8 5.3L 5328CC 325CID
• GMC      Yukon XL 2500   2003 - 2006          V8 6.0L 5967CC 364CID
• GMC      Yukon XL 2500   2003 - 2006          V8 8.1L 496CID
• GMC      Savana 1500       2006 - 2008          V6 4.3L 262CID
• GMC      Savana 1500       2006 - 2009          V8 5.3L 5328CC 325CID
• GMC      Savana 1500       2003 - 2004          V6 4.3L 262CID
• GMC      Savana 1500       2003 - 2005          V8 5.3L 5328CC 325CID
• GMC      Savana 1500       2008 - 2009          V8 5.3L 5328CC 325CID
• GMC      Savana 2500       2003 - 2005          V6 4.3L 262CID
• GMC      Savana 2500       2003 - 2011          V8 4.8L 294CID
• GMC      Savana 2500       2003 - 2011          V8 6.0L 5967CC 364CID
• GMC      Savana 2500       2006 - 2016          V8 6.6L 6599CC 403CID
• GMC      Savana 3500       2004 - 2011          V8 4.8L 294CID
• GMC      Savana 3500       2003 - 2011          V8 6.0L 5967CC 364CID
• GMC      Savana 3500       2006 - 2016          V8 6.6L 6599CC 403CID
• Hummer              H1           2006       V8 6.6L 400CID
• Hummer              H2           2003 - 2007          V8 6.0L 5967CC 364CID
• Isuzu     NPR       2003 - 2007          V8 6.0L 5967CC 364CID
• Isuzu     Ascender             2003 - 2006          V8 5.3L 5328CC 325CID
• Saab      9-7x       2005 - 2006          V8 5.3L 5328CC 325CID

 Large Case Alternators
220amps at 650 rpms
Full amps at 1800rpms

AutoTech Engineering Alernators require a .5 inch smaller belt than your OEM Alternator

AutoTech Engineering alternators need a minimum of 650rpm to charge.

Unless otherwise quoted or instructed, our units come supplied with the OEM Voltage output for PLUG and PLAY alternators. Voltage settings quoted are already built into the Voltage regulator inside the alternator. A reminder that PCM and ECU type vehicles means that your vehicles “brain/computer” controls the voltages.

Boosted Harness Option
A boosted Harness option is available at additional cost.  If you pick this option your  harness will come already dioded for you.  You can pick from options of 15.3, 15.5 or 15.7 voltages.

What is a Bypass?
If you choose to have a bypass you are wiring to bypass the PCM or ECU control, and we customize a Voltage setting for your vehicle (this allows you to have a higher voltage than your PCM or ECU would allow. This in most cases will end up having your battery light on at all times.

Need help wiring your bypass, or have questions fins out more here:

Tutorial videos & Frequently Asked Questions

Warranty: 1 year parts & lifetime labor

Order Time Frames
Build time is 14 days.
Powder Coating adds up to 5 business days
Shipping takes 5-7 days

If you use klarna pay, Sezzle or Affirm add 7 days for processing.

https://autotechengineeringusa.com/powder_coat_color_chart