---
product_id: 630440131
title: "Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural)"
brand: "mechman alternators"
price: "$1021.21"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/630440131-mechman-390-amp-high-output-alternator-1996-2020-gm-truck
store_origin: US
region: United States of America
---

# 390 Amps peak power output Fits 1996-2020 GM Trucks/SUVs Includes harnesses for dual model years Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural)

**Brand:** mechman alternators
**Price:** $1021.21
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your GM beast with Mechman — because average just won’t cut it.

## Quick Answers

- **What is this?** Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) by mechman alternators
- **How much does it cost?** $1021.21 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/630440131-mechman-390-amp-high-output-alternator-1996-2020-gm-truck)

## Best For

- mechman alternators enthusiasts

## Why This Product

- Trusted mechman alternators brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Engineering:** Crafted with a durable cast exterior and designed for reliable, long-lasting performance under the hood.
- • **Unmatched Power Surge:** Delivers a robust 390 amps to keep your rig fully charged and ready for any adventure.
- • **Seamless Compatibility:** Tailored to fit a wide range of GM Trucks and SUVs from 1996 to 2020, ensuring effortless upgrades.
- • **Plug & Play Convenience:** Comes with harnesses for both 1996-2004 and 2005-2020 models—no guesswork, just install and go.
- • **Exclusive Desertcart Edition:** Stand out with this exclusive high-output alternator, engineered for professionals who demand the best.

## Overview

The Mechman 390-Amp High Output Alternator is a premium upgrade designed for 1996-2020 GM Trucks and SUVs with 4.3L to 6.0L engines. Featuring a durable cast exterior and inclusive harnesses for dual model year compatibility, it delivers a powerful 390 amps output to ensure your vehicle’s electrical system stays robust and reliable. Ideal for professionals seeking a seamless, high-performance alternator replacement with exclusive availability on Desertcart.

## Description

This  Exclusive high output alternator by Mechman is designed to meet the needs of GM trucks and SUVs from 1996 to 2020. With a voltage of 14.5 to 15V and an amperage of 380+, it provides reliable and efficient performance for today's modern AGM style batterys. The alternator comes with a pulley, one wire capable, and clockwise rotation. This alternator is also capable of being run on multiple alternator setups, brackets and custom-made mounts making it extremely versatile. If you are needing higher voltage output for lithium-based batteries, this alternator uses a GM 4pin regulator that will accept Mechman voltage booster harnesses for easy, reliable and cheap voltages up to 17 volts! It also has a 2-year manufacturer warranty and is a performance part suitable for universal fitment. The casting finish adds to the durability of the alternator. We include all necessary wiring harnesses and adapters to fit the year spans from 1996 to 2020. H104 harness for 1996 to 2004 P101 and P103 combo for 2005-2020 The only item left to purchase will be your 0-gauge power and ground wires to go directly to your battery and the half inch shorter belt. Please see gallery picture for belt part number reference. WE MAKE IT EASY!

## Features

- Fits most 1996 to 2020 GM Trucks and SUV's
- Comes with harnesses for both 1996-2004 and also the 2005-2020 models
- Not for racing use and requires a half inch shorter belt for operation
- Includes directions
- One wire turn on and multiple bracket capable
- desertcart Exclusive

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Mechman Alternators |
| Brand | Mechman Alternators |
| Model | 14009390 |
| Item Weight | 16 pounds |
| Item model number | 14009390 |
| Exterior | cast |
| Manufacturer Part Number | 14009390 |

## Images

![Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) - Image 1](https://m.media-amazon.com/images/I/51-h8ZXYSdL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ A great electrical upgrade for car audio!
*by R***. on August 22, 2025*

Easy to install, charging is perfect, provides plenty of power for car audio applications! Perfect for stepping into beginner SPL competition.

### ⭐⭐⭐⭐⭐ Well worth the money!
*by M***  on August 12, 2025*

Works really good and performance is outstanding!

### ⭐⭐⭐⭐⭐ The best accessory to upgrade your electrical system.
*by A***. on August 9, 2025*

Get one!I was in car audio at a high end professional level for about 15 yrs (1993-2008). Now at 47, I still love it and occasionally do installs for friends and family. Granted a lot had changed over the years but there is one thing I can tell you for certain, upgrading to an aftermarket high output alternator like this Mechman's is the single most effective accessory you can add to your vehicle's electrical system period!With everything I can turn on turned on, interior/exterior lights, aftermarket LEDs, AC front and rear, cell phones charging, a 2000 watt bass amp running at 1 ohm and a 500 watt 4 channel amp jammin all at the same time, the voltage DOES NOT DROP below 13.9 volts at idle!!! Before this, a brand new factory 160 amp alternator and 2 brand new AGM batteries could not keep up. At idle, voltage was 11.9. For my 07 Tahoe, 5.3l LT, the pulley was decently smaller so I did swap to their recommended belt size of 93.0 inches. Their chart will give the exact part number.I said to begin with....GET ONE! It's absolutely worth the money!

## Frequently Bought Together

- Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural)
- TKDMR 10pcs 1/0 AWG-3/8 Battery Lugs,Heavy Duty Wire Lugs,Ring Terminals,Battery Cable Ends,0 Guage terminals,Battery Terminal Connectors with 10pcs 3:1 Heat Shrink Tubing
- Dayco 5060923 Poly-Rib Belts

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-12*