JS Alternators
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High Performance Custom Alternators. Powerful, Reliable. Internally Cooled, Regulated
Lifetime Warranty, 1 year parts Custom Reliable High Output Alternators
JsAlternators behind the scenes.
10/05/2026
10/05/2026
Super Duty owners: towing heavy and running dim?
The 6.7 Power Stroke pulls hard on the charging system, especially towing with the lights and trailer brakes on. Our high-output bolt-in gives you the amps to tow, plow and haul without the voltage sag. Bench-tested, plug-and-play, real fitment.
👉 Shop Super Duty fitment: js-alternators.com/collections/f250-super-duty
Winch, lights, fridge, tunes. Your Wrangler runs a lot off one alternator.
The 2007-2011 Wrangler JK (3.8L) is an accessory magnet. Every light bar and winch pull draws the battery down. A high-output bolt-in keeps 14V under load so nothing browns out on the trail. Plug-and-play, built in Anderson, SC.
👉 Find your Wrangler fitment: js-alternators.com/collections/jeep-wrangler-high-output-alternators
10/03/2026
Cummins owners: your electrical system is working overtime.
Grid heaters, lift pumps, a big stereo. The 6.7L Cummins asks a lot of a stock alternator. Our high-output bolt-in holds voltage under all of it. Plug-and-play, bench-tested. Real amperage, no rounding. Pick your exact output on the product page.
👉 Shop the Cummins fitment: js-alternators.com/collections/ram-2500
10/02/2026
Bigger Bigger Power 😀
Your Silverado's factory alternator is the weak link.
The 2014+ Silverado 1500 5.3L leaves the factory with 150 amps, not fine once you add a stereo, lights or a winch. Our bolt-in high-output unit gives you up to 400 amps, plug-and-play, bench-tested before it ships. Built in Anderson, SC. 30+ powder-coat colours.
👉 Find your Silverado fitment — link below 👇.
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Website
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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