Will this fit my truck?

Only selected GM applications are covered, including many 1996-2004 full-size trucks, 1996-2016 Express vans with the 4-pin plug, and several SUVs and vans. Match your year, engine and plug shape before ordering.

Do I need a different belt?

Yes. The 1.75-inch pulley is smaller than stock, so you need a belt about half an inch to one inch shorter for proper tension.

How much does it put out at idle?

Mechman rates it at 180+ amps at idle, with the 400+ amp figure measured at cruising speed and hot rated.

Will it work with my factory wiring?

It is a direct plug-in for GM trucks with the common oval 4-pin plug. Vehicles with the CS144 heavy-duty charging option may need a rectangle-to-oval adapter harness.

Mechman does not recommend sustained use above 5,000 RPM engine speed.

The alternator and the supplied plug. The belt and any adapter harness are not included.

Where is the Mechman 400A Black Billet Alternator cheapest?

At Down4soundshop, for $466.65, 15% under what the other stores charge, as of our latest check.

What do buyers say about the Mechman 400A Black Billet Alternator?

Rated 5 out of 5 from 3 ratings. Buyers like: Very easy install; Accurate numbers and an insane amount of power; Looks clean. Common complaints: Expensive, though buyer feels you get what you pay for.

Where can I buy the Mechman 400A Black Billet Alternator?

11 stores we checked sell it, including Down4soundshop, Mechman Alternators, eBay, Alternator Outlet, Soundlabz.

Mechman 400A Black Billet Alternator Price History: $466.65

What reviewers say

Buyers report very easy installation and output that matches the published numbers. They say it runs large audio systems continuously without dimming and looks clean in the engine bay. The main complaint is cost, though buyers feel the build quality justifies it.

What people mention

OutputPraisedBuyers say it delivers an insane amount of power and matches the rated numbers.
InstallationPraisedOwners report a very easy install, with the supplied plug avoiding the battery light.
Charging stabilityPraisedBuyers running over 5,000 watts continuously report no dimming and no problems.
LooksPraisedOwners say the black billet housing looks clean in the engine bay.
CostCriticisedBuyers call it expensive, though they feel you get what you pay for.

From Down4soundshop

Elite series 400 amp alternator with great amperage output and durability at a great price
6 phase technology with massive twin rectifier assemblies and 12 huge diodes for daily-use durability
Produces 200+ amps at engine idle RPM and 400+ amps at cruising speeds, hot rated
Direct plug-in for trucks originally equipped with the common oval shaped 4 pin plug
Comes with a smaller 1.75 inch diameter alternator pulley
May require an additional rectangle to oval adapter harness if the vehicle had the CS144 heavy duty charging option (not common)

Sizing: Requires a 1/2 inch to one inch shorter than stock drive belt for proper belt tension; not recommended for sustained use above 5,000 RPM engine speed.
Guarantee: 2 year performance guarantee; MechMan limited two year warranty covers repair, customer pays shipping to Mechman and Mechman pays return shipping; void if modif
Shipping: Standard build time on alternators not in stock with Down4Sound is 2 to 3 weeks.
In the box: Alternator, Supplied plug

About the Mechman 400A Black Billet Alternator

Installation Notes:

This unit comes equipped with a smaller 1.75 inch diameter alternator pulley, and will require a slightly shorter drive belt for proper belt tension. Not recommended for sustained use above 5,000 RPM engine speed.

The Elite series 400 amp alternator offers great amperage output and durability at a great price. 6 phase technology, combined with massive twin rectifier assemblies and 12 huge diodes make these alternators totally durable for daily use. 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. Installation Notes: This unit may require an additional rectangle to oval adapter harness if the vehicle was originally equipped with the CS144 Heavy duty charging option from the factory. (this is not common) This unit is a direct plug in for any truck originally equipped with the more common oval shaped 4 pin plug as shown.

Fitment Guide:

Make

Model

Engine Size

Year

Buick

Rainier

5.3L

2004 - 2006

Cadillac

Escalade

5.7 / 6.0 / 6.2

1999 - 2004

Chevrolet

Astro Van

4.3L

1996 - 2005

Chevrolet

Avalanche

All Engines

2002 - 2004

What buyers say

Buyers like

Very easy install
Accurate numbers and an insane amount of power
Looks clean
Running over 5,000 watts continuously when paired with good AGM batteries
No dimming, no problems
Use supplied plug to avoid battery light

Buyers complain about

Expensive, though buyer feels you get what you pay for

Specifications

Audio RMS support: not published
Output: 400+ amps at cruising speeds, hot rated
Idle output: 180+ amps at engine idle RPM
Hot output: cruising figure above
Pulley: 1.75 inch; shorter belt required
Housing: billet aluminum
Finish: black; gloss and coating process not published

Mechman 400A Black Billet Alternator

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Mechman 400A Black Billet Alternator

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