Mechman Alternators 8287240

240 Amp S Series Alternator for Select 2002-2005 GM Vehicles

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Mechman S Series Alternators

The S series family of alternators offers large case alternator performance in a compact package. Highly efficient, these 6 phase alternators use less horsepower per Kilowatt than conventional 3 phase alternators. 12 press fit diodes, twin rectifier plates, and highly efficient twin internal cooling fans make them durable in any application. Smaller, lighter rotors and reduced rotating resistance make them an excellent choice for high RPM or racing applications. Like their big brothers in the Elite series, the S series have hairpin stators and high pole count rotors that create much less Electromagnetic noise than conventional 3 phase alternators.

General Features:

  • 240 amp alternator
  • For use with select 2002-2005 GM Vehicles
  • Cast aluminum construction
  • Cutting edge 6 phase hairpin epoxy reinforced stator technology
    • Improves durability
    • Increases high RPM stability
  • Oversized charge post ensure sturdy cable connections
  • Premium low-drag bearings
  • Ultra precision balanced rotor
    • Provides 20,000 RPM capability
  • Twin solid copper rectifiers with 12 press fit high amp diodes to spread out heat
  • 15% more efficient than typical alternators
    • Wastes less horsepower in the form of heat
  • Precision pulley machined from bar stock
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty

Compatibility List

  • Buick
    • 2002 - 2005 Century w/ 3.1L Engine
    • 2002 - 2004 Regal w/ 3.8L Engine
  • Chevrolet
    • 2002 - 2005 Impala w/ 3.4L Engine
    • 2002 - 2005 Impala w/ 3.8L Engine
    • 2002 - 2005 Monte Carlo w/ 3.4L Engine
    • 2002 - 2005 Monte Carlo w/ 3.8L Engine

Not Sure Which Alternator Fits Your Vehicle?

Check the Mechman Alternators Vehicle Fit Guide to find the right alternator for your vehicle!

Product Specifications

Amperage Output
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.
Buick Century
Buick Regal
Chevy Impala
Chevy Monte Carlo

Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


savannah, GA

Verified Purchase
mechman 240 amp alternator

August 22, 2015

Product was as described . Arrived 2 weeks before estimated delivery date! Works perfect. I would definitely buy again

8 of 9 found this helpful

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james r


Mechman is the shit...

August 6, 2016

Being new to sonic electronix I had no idea what to expect... I gotta say I waited 2 weeks for the order in verification process... Someone finally called me after I emailed them I was quite anxious to receive and install the alternator I happened to miss the call before 7 am so I returned the call... Come to find out I needed to answer a series of questions that had nothing to do with the purchase of a car part of all things I guess because it's was quite expensive this is standard procedure... I was on the phone for around 20 minutes for the questionnaire to not even work I then had to wait for the store to open so I could try to fax a paper copy back to them... Guess what their fax system was down the whole time. Woulda been nice to know before the 3 hours I spent at the fed ex store... After 3 more days of nothing I called back and requested someone try verifying my order over the phone so I could get my product that I had already paid for almost a month prior... Finally the order was sent to Mechman for fulfillment I was quoted another month wait time... It did come a week early so that was good... After everything experienced the people I did get to speak to where great... I would buy from again maybe just smaller cheaper orders... The product is outstanding keeps voltage at 15+ while car is running even at idle it's above 15 at battery Would recommend to anyone needing to upgrade their electrical

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Accessory Tools and Products

Accessories added

MechMan Alternators BIG3

Premium Zero Gauge "Big 3" Cable Upgrade Kit

Your Price $69.95

Perfect Match Big 3 Kit

Get the right Big 3 Kit to go with your High Output Alternator

Your Price $65.99

Mechman Alternators 1020R

Secondary Battery Installation Kit for Audio Systems up to 4000 Watts

Your Price $89.00

Browse 1 question and 1 answer
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Why did you choose this?
Sonic Electronix Store
My husband wants it
Marissa C on Nov 24, 2017

Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Mechman Alternators 8287240

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Mechman Alternators 8287240

240 Amp S Series Alternator for Select 2002-2005 GM Vehicles


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MechMan Alternators BIG3

Premium Zero Gauge "Big 3" Cable Upgrade Kit


Mechman Alternators 1020R

Secondary Battery Installation Kit for Audio Systems up to 4000 Watts



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