---
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)"
price: "R15010"
currency: ZAR
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.za/products/630440131-mechman-390-amp-high-output-alternator-1996-2020-gm-truck
store_origin: ZA
region: South Africa
---

# 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)

**Price:** R15010
**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)
- **How much does it cost?** R15010 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/630440131-mechman-390-amp-high-output-alternator-1996-2020-gm-truck)

## Best For

- Customers looking for quality international products

## Why This Product

- 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 desertcart 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!

Review: Great 390 amp alt - Had this for about 3 months now, holding up fine, make sure you hook it up to switched wire😅 didnt do this at first, have it running with 5500 watts (4500 and 1000w amp) and works fine, sees 5k rpms almost daily and works great, highly recommend especially for the price, sitting at about 14.5-14.8v with engine on, fits 97 Silverado vortec 305, actually makes more than 390, got a sticker said it makes like 413 max, get a big 3 1/0 ofc upgrade when getting this alt for best performance.
Review: Amazing alternator. - Alternator is amazing! Sold me a 390 amp that actually tested at 417 amp on the dyno and 203 at idle! Definitely cured my lack of amps problem. Mechman you guys are amazing. 👏

## 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)
![Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) - Image 2](https://m.media-amazon.com/images/I/61sp5YB+cKL.jpg)
![Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) - Image 3](https://m.media-amazon.com/images/I/41xO8AXqzgL.jpg)
![Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) - Image 4](https://m.media-amazon.com/images/I/31YIrJU+VdL.jpg)
![Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) - Image 5](https://m.media-amazon.com/images/I/41qUJho-FwL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great 390 amp alt
*by K***L on October 23, 2025*

Had this for about 3 months now, holding up fine, make sure you hook it up to switched wire😅 didnt do this at first, have it running with 5500 watts (4500 and 1000w amp) and works fine, sees 5k rpms almost daily and works great, highly recommend especially for the price, sitting at about 14.5-14.8v with engine on, fits 97 Silverado vortec 305, actually makes more than 390, got a sticker said it makes like 413 max, get a big 3 1/0 ofc upgrade when getting this alt for best performance.

### ⭐⭐⭐⭐⭐ Amazing alternator.
*by O***E on December 11, 2025*

Alternator is amazing! Sold me a 390 amp that actually tested at 417 amp on the dyno and 203 at idle! Definitely cured my lack of amps problem. Mechman you guys are amazing. 👏

### ⭐⭐⭐⭐⭐ Good deal
*by J***T on December 31, 2025*

Works great, good price and fit right into my 5.3l gen 3. Everything is pretty much included you should upgrade the wire size on your vehicle.

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.co.za/products/630440131-mechman-390-amp-high-output-alternator-1996-2020-gm-truck](https://www.desertcart.co.za/products/630440131-mechman-390-amp-high-output-alternator-1996-2020-gm-truck)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-12*