About Us

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.

That focus is deliberate. A 400-amp alternator that bolts into a 6.7L Cummins is a different part, with different clocking, a different case, and a different pulley than the one that fits an LB7. Getting that right is most of the job.

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.

Why Mechman

  • Two-year warranty on every unit
  • Direct bolt-in fitment — no bracket fabrication on most applications
  • Real output at idle, which is 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 than OEM, with the thermal headroom to hold it

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.

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.

Get In Touch

Phone: (518) 302-1341
Email: sales@dieselalternators.com
Hours: Monday–Friday, 9:00am–5:00pm EST
Address: 170 Highland Rd STE 1, Massena, NY 13662

Free shipping on orders over $199 in the US48.