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Mechman Alternators

Mechman Alternators 400-Amp Black High Output Alternator 1996-2004 GM Truck 4.3L 4.8L 5.3L 5.7L 6.0L (Black)

  • Based on 21 reviews
Condition: New
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$549.00 Why this price?

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Availability: In Stock.
Fulfilled by Big Jeff Online Inc
Arrives Wednesday, Sep 16
Order within 3 hours and 15 minutes
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Color: Black


Features

  • Fits select 1996-2004 GM TRUCK/SUV
  • MUST USE 1/2" SHORTER SERPENTINE BELT
  • NOT FOR HIGH RPM USAGE (over 6,000rpm's)

Description

The Elite series 400 amp alternator offers great amperage output and durability at a great price. These impressive alternators produce 200+ at engine idle RPM and 400+ amps at cruising speeds HOT RATED. Like most high output alternators, this unit comes with a smaller diameter pulley, and will require a 1/2 inch to one inch shorter than stock length belt for proper belt tension in most applications.

Manufacturer: ‎Mechman Alternators


Brand: ‎Mechman Alternators


Model: ‎400 amp alternator


Item Weight: ‎16 pounds


Package Dimensions: ‎10 x 10 x 10 inches


Item model number: ‎8206400-BLAC


Exterior: ‎BLACK


Manufacturer Part Number: ‎8206400


Date First Available: September 14, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Sep 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Service break booster error (fixed)
Review Image by Amazon Customer
Review Image by Amazon Customer
Review Image by Amazon Customer
Installed on am 03 Avalanche. Now getting an error message saying service break booster. Removed and installed faftory alternator and the message went away, installed this again and the service message comes up again. Any advice would help. Edit: So it turns out that the 3 pin connector that came was not wired correctly. I had to depin A and D on the harness to get rid of that booster error. Truck runs amazing, upgrading to 5 stars now. ... show more
Reviewed in the United States on July 17, 2025 by Amazon Customer
    • Bang for the buck
Work Great for applications of 6000watts and more
Reviewed in the United States on November 27, 2025 by Amazon Customer
    • Does not work
Review Image by Caleb s.
Review Image by Caleb s.
The alternate y’all sold me does not work on my S-10. Yall said it would work but I can’t put the throttle bracket on that holds the throttle cable
Reviewed in the United States on May 17, 2024 by Caleb s.
    • Plug & play fixed my voltage drop
Review Image by johnny
Solved my problems no more headlights dimming or voltage drops on my 98 suburban 1500 when I'm playing my music almost full tilt with my headlights & a/c on my voltage hangs at 14.02 - 14.07 . My stock alternator it was dipping down in the 11.5 to 11 volts range which can be damaging for the electrical and all the electronics. Very satisfied ... show more
Reviewed in the United States on March 3, 2024 by johnny
    • Looks good and does it's job!
AMAZING!!!! DUDE I own a Chevy Silverado. If you know u know the electrical issues lol This solved it.! Bonus IT LOOKS AWESOME AS WELL...LOL
Reviewed in the United States on June 26, 2025 by Stacy Stanley
    • It didn't work for me.
I installed it, and even though it's a 400-amp alternator, I'm experiencing voltage drop, despite upgrading the system with 2/0 gauge wiring. The music volume doesn't even reach half of what it should. I did my "big 3" upgrade.
Reviewed in the United States on January 24, 2026 by José Alberto
    • No word to say
Good on the money
Reviewed in the United States on March 22, 2025 by Ac
    • Not worth it
It said it would fit on my ‘02 Chevy Silverado & it doesn’t. Harness is on the opposite side & to big. Now I’m stuck with it.
Reviewed in the United States on January 2, 2026 by Mj Patino

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