About Us

Diesel Alternators · Authorized Mechman® Dealer

WHY CHOOSE
DIESEL ALTERNATORS?

We're an authorized Mechman dealer in Massena, New York, and we sell one thing well: high output charging systems for diesel trucks. Alternators, batteries, and the cable to tie them together — for Duramax, Cummins and Power Stroke platforms from the late '90s through the current model year.

Authorized Dealer Made in the USA 2-Year Warranty
(518) 302-1341 Get Fitment Help

Fifteen Years With Mechman

We've worked directly with Mechman for over fifteen years — cataloging their lineup, shooting their product photography, and handling brand marketing. That's not a drop-ship arrangement. It means we know the part numbers, the running changes, the case styles, and the fitment quirks that never make it onto a spec sheet.

We stock the top-selling Mechman part numbers and can source the rest. When something isn't on the shelf, it gets built — Mechman has been assembling alternators in Knoxville, Tennessee since 1978, and custom lead times are among the fastest in the industry.

15+Years partnered with Mechman
1978Building alternators in Knoxville, TN
2-YrWarranty on every unit
US48Free shipping over $199

The Difference

Why Mechman

Mechman builds direct bolt-in high output charging solutions. If you're running a winch, a plow, an inverter, upfitted work lighting, a lift gate, or a serious audio system — anything that pulls hard while the truck idles — a stock alternator is the part that gives up first.

Two-Year Warranty

On every unit — not a limited pro-rated promise, real coverage.

Direct Bolt-In Fitment

No bracket fabrication on most applications. It goes where the OEM unit came out.

Real Output at Idle

Where a diesel spends most of its life when the plow is down or the truck is parked and working.

Built to Order

When it's not in stock — not backordered indefinitely.

Higher Sustained Output

More than OEM, with the thermal headroom to hold it.

Before You Buy

Fitment Help Before You Buy

Amperage isn't the only number that matters. The wrong pulley, the wrong clocking, or a stock charge wire behind a 400-amp unit will put you right back where you started. We'd rather spend ten minutes on the phone getting it right than process a return.

Tell us the year, the engine, and what you're powering. We'll tell you which unit fits, whether you need a dual alternator bracket, and whether your existing cable can carry it. If a Big3 upgrade is what you actually need instead of more amps, we'll say so.

Talk to a Human

Get In Touch

Phone (518) 302-1341 Email sales@dieselalternators.com
Hours Mon–Fri, 9:00am–5:00pm EST
Address 170 Highland Rd STE 1
Massena, NY 13662
Free shipping on orders over $199 in the US48.