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.

High Output Alternators

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High Output Alternator

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High Output Alternators for All Makes & Models

At PowerBastards, we specialize in high-output alternators built to handle serious power demands. Whether you're running a high-performance engine, off-road lighting, a competition-grade audio setup, or a heavy-duty fleet vehicle, our alternators deliver unmatched performance and reliability. We carry high-output alternators for nearly every make and model, ready to bolt on and boost your vehicle’s electrical system.

What Is a High-Output Alternator?

A high-output alternator is designed to produce significantly more amperage than a stock unit. Stock alternators typically max out around 90–130 amps, which can fall short when powering modern upgrades like high-wattage sound systems, LED light bars, winches, or aftermarket ignition systems. That’s where high-amp alternators come in—pushing well beyond 200+ amps to keep your voltage stable and your electronics running strong.

These high-voltage alternators are engineered with larger stators, upgraded windings, and precision-balanced rotors to outperform factory units in durability and capacity. Ideal for power-hungry vehicles, they’re the solution when your electrical needs go beyond OEM limits.

Why Choose a High-Amp Alternator?

A factory alternator might cut it for a daily driver, but not for performance enthusiasts or professionals who demand more. Our high amp alternators are perfect for:

Off-roaders with winches, LED lighting, and lift kits
Car audio builds with multiple amplifiers and subwoofers
Fleet and towing vehicles using GPS, refrigeration, or communication gear
Tuned performance vehicles with ECU, ignition, and fuel system upgrades

With high-power alternators, you get stable power delivery and less strain on your battery, even at idle. That means longer battery life and zero voltage drops when it matters most.

Shop High Performance Alternators by Vehicle Make

It’s fast and easy to find a high-output alternator for your vehicle. Use our “Choose Your Make” tool to browse compatible models by manufacturer. We stock alternators for:

Ford (F-150, Mustang, Super Duty)
Chevy (Silverado, Camaro, Tahoe)
Dodge (Ram, Charger, Durango)
Toyota (Tundra, 4Runner, Tacoma)
And more—over, 50 vehicle makes are supported

Every product is engineered for a direct fit with no modifications needed. Simply select your make and model to explore available options.

Built for Power: Who Needs a High-Output Alternator?

If your vehicle’s electrical load exceeds what the stock alternator can handle, you’ll see dimming lights, slow starts, or even system failures. Here are the most common signs it's time for a high-performance alternator upgrade:

Dimming headlights when idling or using accessories
Weak or fluctuating voltage readings
Upgraded audio or lighting systems
Poor battery performance despite new replacements

Whether you're building a show car, work truck, or trail beast, a high-voltage alternator is a must for consistent, safe power.

Compatible Brands & Applications

We support all major brands and models. Our alternators are trusted in:

Trucks & SUVs for towing, lighting, and winch use
Performance cars need electrical stability under high RPMs
Fleet vehicles with commercial loads and electronic equipment
Show vehicles and custom builds with aftermarket accessories

Choose from high-power alternators specifically designed for your platform and driving style.

Free Ground Shipping on Orders Over $249

Power up without the extra cost. When you spend $249 or more, we’ll ship your High Output Alternator anywhere in the continental U.S. at no charge. That includes all high-amp alternators, even our most powerful models.

Do you need help choosing the right alternator? Do you have questions about fitment or amperage? Our team is ready to help. Reach out to us or call today for expert support.

Power up your ride and ship it free—spend $249 and get ground shipping on us!