--- product_id: 721513697 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" price: "$1928.40" currency: USD in_stock: true reviews_count: 5 url: https://www.desertcart.us/products/721513697-mechman-390-amp-high-output-alternator-1996-2020-gm-truck store_origin: US region: United States of America --- # 390+ Amps Peak Output Supports AGM & Lithium Batteries Fits 1996-2020 GM Trucks/SUVs Mechman 390-Amp High Output Alternator 1996-2020 GM Truck/SUV 4.3L 4.8L 5.3L 5.7L 6.0L (Natural) **Brand:** mechman **Price:** $1928.40 **Availability:** ✅ In Stock ## Summary > ⚡ Power Up Your GM Beast – Never Settle for Less! ## 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 - **How much does it cost?** $1928.40 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/721513697-mechman-390-amp-high-output-alternator-1996-2020-gm-truck) ## Best For - mechman enthusiasts ## Why This Product - Trusted mechman brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal GM Fitment:** Seamlessly compatible with most GM trucks and SUVs from 1996 to 2020, with included harnesses for easy installation. - • **Powerhouse Performance:** Delivers a robust 390+ amps, tested up to 417 amps, ensuring your rig never runs low on juice. - • **Advanced Battery Support:** Optimized for modern AGM batteries and upgradeable to 17V for lithium setups with Mechman voltage booster harnesses. - • **Versatile Mounting Options:** One-wire turn-on and multiple bracket compatibility make custom setups and multi-alternator configurations a breeze. - • **Durability Meets Convenience:** Cast exterior finish for long-lasting durability, backed by a 2-year warranty and clear installation directions. ## Overview The Mechman 390-Amp High Output Alternator is engineered for GM trucks and SUVs (1996-2020), delivering reliable 14.5-15V output with peak amperage exceeding 390 amps. It supports AGM and lithium battery systems, includes all necessary harnesses for easy fitment, and offers versatile mounting options. Built tough with a cast finish and backed by a 2-year warranty, this alternator is the ultimate upgrade for professionals demanding consistent, high-performance power. ## Description This 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: 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: 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D3SF6DFH | | Brand | Mechman | | Customer Reviews | 4.6 4.6 out of 5 stars (51) | | Date First Available | 6 July 2024 | | Exterior | cast | | Item Weight | 7.26 Kilograms | | Item model number | 14009390 | | Manufacturer | Mechman Alternators | | Manufacturer Part Number | 14009390 | | Model | 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/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 4](https://m.media-amazon.com/images/I/41qUJho-FwL.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/41CTqlpYaeL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by K***L on 23 October 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. ### ⭐⭐⭐⭐⭐ Review *by O***E on 11 December 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. 👏 ### ⭐⭐⭐⭐⭐ Review *by J***T on 31 December 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.us/products/721513697-mechman-390-amp-high-output-alternator-1996-2020-gm-truck](https://www.desertcart.us/products/721513697-mechman-390-amp-high-output-alternator-1996-2020-gm-truck) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-18*