The alternator I bought from you doesn't work.

Each alternator is bench-tested before shipping. Apparent failure is usually due to ordering the wrong unit, shipping damage, or installation mistakes. Verify the part number, inspect for damage, and review the proper installation steps (Technical Tip TT-648) before contacting support.

The alternator I bought from you doesn't "put out".

Low-output symptoms are often caused by factors outside the alternator. Measure voltage directly at the rear of the unit with a digital meter; if readings seem low, check the common issues listed below or return the alternator for a free bench test.

High-output alternators ship with an overdrive pulley that may require a belt about 1 inch shorter than stock. Use a quality, oil-free belt to prevent slip and ensure full output.

Regulator plug not plugged in, not seated properly or pinched wire

Make sure the small regulator plug on the alternator is fully seated and oriented correctly. A pinched or missing connection will prevent charging. Self-exciting models (e.g., Fitzall 220A+) do not use this plug.

Battery warning light bulb in dash missing, blown or bad connection

Some vehicles rely on the dash battery-warning bulb to excite the alternator. A blown, missing, or poorly connected bulb can cause a no-charge condition.

Customer changed alternator pulley

Replacing the supplied overdrive pulley with a larger-diameter pulley slows the alternator and decreases charge output.

Vehicle crankshaft pulley diameter too small

Aftermarket under-drive crank pulleys spin accessories more slowly and can severely reduce alternator output. Ensure the crank pulley is at least OEM size.

Main vehicle charge wire too small or not upgraded

Factory charge wiring is sized for OE amperage. When loads rise, upgrade to a heavier-gauge cable such as the Big Zero kit to avoid voltage drop and false low-output symptoms.

Too many grounds, insufficient grounds, or just bad wiring

Improper, corroded, or excessive grounds-as well as undersized or poorly crimped wires-can cripple alternator performance. Have a qualified technician inspect and correct wiring.

Bad, old, weak, damaged or cheap battery

Weak or inexpensive batteries-especially some gel-cell types-may not accept the alternator's current. Use a healthy wet-cell battery with sufficient cold-cranking amps.

Alternator possibly damaged during installation

High-output units contain sensitive electronics. Skipping the recommended battery-disconnect procedure or other steps in Technical Tip TT-648 can damage the regulator and cause no-charge conditions.

The alternator I bought from you doesn't fit.

Direct-fit models require no hardware changes. Universal Fitzall 220A+ units need custom brackets and may require a shorter belt.

Do you sell brackets, spacers or hardware to mount the Fitzall on my particular application?

Due to the vast number of vehicles, PowerBastards does not supply custom mounting hardware. Most customers fabricate brackets themselves or hire a qualified shop.

I tested my alternator and it only makes 30A.

Alternators supply only the amperage the system demands. Clip-on amp meters can be inaccurate; 30 amps may be normal at low load. Send the unit in for a free certified output test if in doubt.

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High Output Alternators for AM General Hummer

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Hummer H1

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When it comes to taking on the toughest terrains and extreme conditions, Hummer vehicles are in a class of their own. To keep your electrical system in peak condition, a high-output alternator for Hummer is essential. At PowerBastard, we are proud to offer a range of high-output alternators specifically designed to meet the rigorous demands of off-road enthusiasts and heavy-duty applications. Whether you're powering off-road lighting, winches, or air compressors, our Hummer high amp alternators are engineered to deliver unmatched performance, no matter the challenge.

Upgrade Your Hummer with a High-Amp Alternator

Your Hummer's electrical system requires a substantial amount of power to run high-draw accessories like lights, winches, or navigation systems. A Hummer performance alternator from PowerBastards is designed to handle this demand. With a higher amperage output, this alternator ensures your vehicle's electrical system is stable under even the harshest conditions. Whether you're crawling through rugged trails or stuck in tough terrain, our alternators provide continuous, reliable power to keep all your systems running without failure.

Why Choose a High-Output Alternator for Your Hummer?

If you are an off-road enthusiast or rely on your Hummer for demanding tasks, you understand the importance of maintaining a stable and powerful electrical system. Our heavy-duty alternators for Hummer offer the following benefits:

Increased Electrical Output: Power everything from lights and winches to air compressors without stressing your vehicle's electrical system.
Reliable Power: Enjoy stable voltage and uninterrupted performance during long, low-speed off-road crawls or when operating heavy equipment like winches.
Easy Installation: Our aftermarket alternators for Hummer are engineered for a direct-fit installation, making the upgrade process simple and hassle-free.
Improved Battery Life: By upgrading to a high-amperage alternator for Hummer, you can extend your battery life and reduce the risk of electrical system failures, even in extreme conditions.

Engineered for Hummer's Toughest Demands

Hummer vehicles are built for durability, but even the toughest trucks need a reliable electrical system to back them up. A Hummer alternator upgrade from PowerBastards is the ideal solution to avoid power surges and overloads that can damage your onboard electronics or leave you stranded. Our Hummer high amp alternators have been tested and engineered to handle the most extreme environments, from off-roading in harsh conditions to hauling heavy-duty equipment.

Explore Our Range of High-Output Alternators for Hummer Models

PowerBastards offers a wide selection of high-output alternators for Hummer, compatible with various Hummer models. These models require high-performance electrical systems, and our alternators are specifically engineered to meet those needs.

Compatible Hummer Models

H1 — Built to handle extreme off-road conditions, heavy winches, and additional lighting without power loss.
H2 — Supports advanced entertainment systems, off-road accessories, and high-demand electrical setups.
H3 — Provides steady, reliable power for daily driving and rugged trail adventures alike.

Find the perfect high-output alternators for Hummer and equip it with the dependable power needed for any adventure. Keep your Hummer ready to conquer every trail and challenge with confidence.