JS Alternators

JS Alternators High Performance Custom Alternators. Powerful, Reliable. Internally Cooled, Regulated
Lifetime Warranty, 1 year parts Custom Reliable High Output Alternators

A discount helps, but correct fitment matters more. During the Labor Day Sale, save 10% on high-output alternators throu...
09/04/2026

A discount helps, but correct fitment matters more. During the Labor Day Sale, save 10% on high-output alternators through September 9, and send the team your vehicle details if you need help choosing.

The JS Alternators Labor Day Sale starts tomorrow. From September 5-9, save 10% on high-output alternators. Send us your...
09/04/2026

The JS Alternators Labor Day Sale starts tomorrow. From September 5-9, save 10% on high-output alternators. Send us your year, make, model, engine, and system goal if you need help choosing the right unit.

JsAlternators.comHigh Output Alternators Made in the USA 🇺🇸
09/04/2026

JsAlternators.com
High Output Alternators
Made in the USA 🇺🇸

09/03/2026

If you've added a winch, lights, an inverter, or a fridge to your truck or camper, you've added load the factory alternator wasn't built for. That's where voltage drop and hard starts come from. The answer is matching output to your real electrical demand. Comment your setup and we'll help you size it right.

09/02/2026

Voltage drop under load is the quiet killer of a good electrical build. Here's a side-by-side: factory alternator vs. our 250-amp GM billet high-output unit, measured under real load. The billet holds. That's what 16 years of building these gets you. $549, multiple color options link below.

09/01/2026

Running a 1999–2004 Silverado 1500 with the 5.3L? Our high-output alternator comes in four output levels 250, 320, 370, and 400 amp ($399–$559) so you match the alternator to your actual electrical load. Direct fit for your year and engine, built and tested in-house. Confirm fitment and pick your amperage on the product page below.

Your alternator and battery work better when they are built to support the same goal.Pair an XS Power battery with a JS ...
08/31/2026

Your alternator and battery work better when they are built to support the same goal.
Pair an XS Power battery with a JS Alternator and receive 10% off your alternator. A strong electrical foundation helps keep your high output setup performing reliably.
Shop JS Alternators and XS Power today.

Address

146 W. Phillips Road Suite H
Greer, SC
29650

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

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