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1.8K+ items soldSelling since 2015
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High Output Alternators, Batteries & Electrical Upgrades
#1 Best sellerSave $50
2005-2013 GM Truck & SUV
STOP VOLTAGE DROP ON YOUR GM TRUCK
The Mechman 400 amp RVC bypass alternator keeps your charging voltage up when the lights, winch or amplifiers are pulling hard.
- 400 amp max output
- RVC bypass design
- Fits 4.3L, 4.8L, 5.3L, 5.7L & 6.0L
- Available in 8 billet finishes
FitsSilveradoSierraTahoeYukonSuburbanAvalanche
Finish Standard
$549.00$599.00
Top pickSave $100
2014+ Chevrolet, GMC & Cadillac
400 AMP ALTERNATORS FOR 2014+ GM TRUCKS
An RVC bypass high output alternator built for 2014 and newer GM trucks and SUVs running serious electrical loads.
- 400 amp max output
- RVC bypass design
- Built for 2014+ GM applications
- Billet finishes available
FitsSilveradoSierraTahoeYukonSuburbanEscalade
Finish Standard
$549.00$649.00
Fan favoriteSave $50
1996-2004 GM Truck & SUV
400 AMPS FOR YOUR CLASSIC GM TRUCK
A direct replacement high output alternator for 1996-2004 GM trucks and SUVs, available in painted and billet finishes.
- 400 amp max output
- Fits 4.3L, 4.8L, 5.3L, 5.7L & 6.0L
- Painted and billet finishes
- Direct bolt-in replacement
FitsSilveradoSierraTahoeYukonSuburbanAvalanche
Finish Standard
$549.00$599.00
Shop by vehicle
Top-selling alternators
-28%
Mechman 250 Amp Alternator 2005-2013 GM Truck 4.3L 4.8L 5.3L 5.7L 6L
From $429.00$599.00
Options
XS Power BIG3XP Big 3 Wiring Upgrade Kit - 1/0 AWG XP Flex
$99.99
Sold out
XS Power BIG3XP Big 3 Wiring Upgrade Kit - 1/0 AWG XP Flex
$99.99
Sold out
XS Power D1400 14V AGM Battery
$429.99
XS Power BIG3XP Big 3 Wiring Upgrade Kit - 1/0 AWG XP Flex
$99.99
Sold out
-28%
Mechman 250 Amp Alternator 2005-2013 GM Truck 4.3L 4.8L 5.3L 5.7L 6L
From $429.00$599.00
Options
XS Power BIG3XP Big 3 Wiring Upgrade Kit - 1/0 AWG XP Flex
$99.99
Sold out
XS Power BIG3XP Big 3 Wiring Upgrade Kit - 1/0 AWG XP Flex
$99.99
Sold out
XS Power BIG3XP Big 3 Wiring Upgrade Kit - 1/0 AWG XP Flex
$99.99
Sold out
XS Power PWR-S5-6500 Group 65 12V Lithium Titanate (LTO) Battery
$699.99
Sold out
XS Power PWR-S6-6500 Group 65 14V Lithium Titanate (LTO) Battery
$699.99
Sold out
Retro Pro 30 Limitless Lithium
$699.00
Sold out
Retro Pro 56 Limitless Lithium
$1,339.00
Nano-HDv3
$799.00
Retro Pro 30 Limitless Lithium With 3.5A Battery Maintainer
$759.00
Sold out
Nano -UTV / Power sports Battery
$749.00
Sold out
Nano - UTV / Power sports Battery With 3.5A Battery Maintainer
$809.00
Sold out
Nano -HD XL Motorcycle / Power sports Battery
$749.00
Sold outShop by Category
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Open Box Deals! *New*
All Open Box-
Mechman 170 Amp Racing Alternator 1965-1985 GM - Black (Open Box)
Sale price $299.00Regular price $349.00 -
Mechman 370 Amp High Output Alternator Ram 5.7L HEMI (Open Box)
Sale price $529.00Regular price $699.00 -
Mechman 240 Amp High Output Alternator Buick Enclave / GMC Acadia 3.6L (Open Box)
Sale price $379.99Regular price $529.00
Now at Alternator Outlet
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Every box is built around one specific subwoofer, matched to its recommended volume, tuning and port area, then CNC-cut and hand-finished in Thousand Oaks, California.
- 413+ sub-specific designs
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- Baltic birch or MDF
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Bracket Kits
Dual KitsTriple Kits
Dual Kits
- Dual Kits
- Triple Kits
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Why Alternator Outlet
The high output alternator specialists
Alternator Outlet is an authorized dealer of Mechman high output alternators, XS Power batteries and American Bass car audio. We help you build a complete charging system, from the alternator and Big 3 wiring to the AGM or lithium battery that goes with it.
Whether you're powering a competition sound system, a work truck, a plow, a winch or an off-road lighting setup, we'll help you choose the right output for your vehicle.
15+ yrsWorking directly with Mechman
99.5%Positive eBay feedback
4K+Items sold & shipped Online and eBay since 2015
$199+Free shipping to the US lower 48
Mechman experts since day one
We've worked directly with Mechman for more than ten years on cataloging, product photography and marketing, so we know the lineup, part numbers and fitment inside out.
Shop Mechman →Fitment help from real people
Not sure which output or configuration fits your build? Call or message us with your year, make, model and engine and we'll point you to the right part.
Shop by vehicle →Complete charging systems
Match your high output alternator with a Big 3 wiring upgrade, AGM or lithium battery and voltage control, all from one place.
Big 3 kits →XS Power batteries
Authorized XS Power dealer for AGM, lithium titanate and capacitor bank batteries built for high current car audio and performance vehicles.
Shop XS Power →Free shipping over $199
Free shipping on qualifying orders to the US lower 48. See our shipping page for details and exclusions.
Shipping & returns →Lease-to-own available
Upgrade now and pay over time with Acima lease-to-own. No perfect credit required.
Learn more →Why Mechman
Bolt-in high output alternators, built since 1978
Mechman designs and builds high output alternators in Knoxville, Tennessee from premium new components. Each one is made for a specific vehicle, so it bolts in where your factory alternator came out.
- Direct bolt-in fitment
- Premium new components
- Cast and billet housings
- Dual and triple alternator kits
- ISO 9001:2015 certified
- Available in custom colors
Not sure which alternator you need?
Tell us your vehicle, engine and electrical load. We're available Monday to Friday, 9am to 5pm Eastern.
AGM Batteries
-
![D4800]()
XS Power D4800 Group 48 12V AGM Battery
Regular price $399.99 -
![D3400]()
XS Power D3400 Group 34 12V AGM Battery
Regular price $419.99 -
![D3400R]()
XS Power D3400R Group 34R 12V AGM Battery
Regular price $419.99
Lithium Batteries
-
![XS Power xMAX 90 Group 31 12V LiFePO4 Lithium Battery - 90Ah]()
XS Power xMAX 90 Group 31 12V LiFePO4 Lithium Battery - 90Ah
Regular price $1,099.99 -
![XS Power RSV-46 Titan8 Group 34 12V Lithium Titanate Battery - 1500 CA]()
XS Power RSV-46 Titan8 Group 34 12V Lithium Titanate Battery - 1500 CA
Regular price $999.99 -
![Retro Pro 30 Limitless Lithium]()
Retro Pro 30 Limitless Lithium
Regular price $699.00
NoLi Batteries
-
![NoLi Sodium 50Ah Limitless Lithium Battery]()
NoLi Sodium 50Ah Limitless Lithium Battery
Regular price $1,199.00 -
![NoLi Sodium 30Ah Limitless Lithium Battery]()
NoLi Sodium 30Ah Limitless Lithium Battery
Regular price $699.00 -
![NoLi Sodium 12Ah Limitless Lithium Battery]()
NoLi Sodium 12Ah Limitless Lithium Battery
Regular price $399.00
Capacitors
-
![33-1100]()
XS Power 33-1100 SuperCELL Ultracapacitor - 2.7V 3000 Farad
Regular price $44.99 -
![33-1200]()
XS Power 33-1200 SuperCELL Ultracapacitor - 2.85V 3150 Farad
Regular price $52.49 -
![SB75-5]()
XS Power SB75-5 SuperBANK Compact 12V Capacitor Bank - 75F 600W
Regular price $249.99
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High Output Alternator Information & Guides
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