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Mechman high output alternators · Authorized dealer
Hang a snowplow off the front of a Sierra HD, drop a spreader in the bed, or bolt on a service body with a liftgate, and the truck becomes a rolling power plant. Every one of those tools runs off the charging system. Here is every Mechman alternator listed for the GMC Sierra HD years we cover. Find your year and engine, then choose a Sierra HD high output alternator that matches the equipment.
Plow pumps draw heavily each time the blade lifts or angles. Spreaders, beacons, work lights and a liftgate motor add to it, and many of these trucks run for hours at low speed in the cold. Service trucks bring their own list: inverters for power tools, compartment lighting and radio gear. A Sierra HD high output alternator gives that equipment its own margin, so the batteries are not drained by the end of a shift.
The year and engine finder at the top of the page lists 1996-2000 diesel trucks, 2001-2007 trucks with the 6.6L diesel, and gas trucks from 2014-2018 and 2019-2023. Each group uses its own alternator series. The 2001-2007 diesel option is a large case unit with a side output stud, so check case size and stud location against your truck. Match your year and engine before anything else.
Choices here are 170, 240, 250, 320, 370 and 400 Amp. A lighter upfit with strobes and work lights runs comfortably on 240 or 250 Amp. A plow truck with lights and a spreader is a natural match for 320 or 370 Amp. 400 Amp is the pick for service bodies with inverters, or a plow truck that also runs an audio system. 170 Amp is the mild option. Choose the Sierra HD high output alternator that covers your busiest day.
Fleet trucks usually get standard housings with a factory look. Billet cases, machined from solid aluminum, add finishes like orange, yellow, black and blue for owners who want a custom touch. On equipment trucks, a solid harness matters as much as amperage; see our alternator harnesses and regulators and the Big 3 wiring kits. The Chevrolet twin of this truck has its own Silverado HD page, and our wider GM and GMC alternator collection covers other models. The whole grid is made up of Mechman high output alternators, so the choice comes down to fitment and output.
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Shop Pay Installments: Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. Snap: The advertised service is a lease-to-own agreement provided by Snap RTO LLC. Lease-to-own financing is not available to residents of Minnesota, New Jersey, and Wisconsin. ¹ Not all applicants are approved. While no credit history is required, Snap obtains information from consumer reporting agencies in connection with submitted applications, and your score with those agencies may be affected. Sezzle: Issued by WebBank or Sezzle. See loan agreement for details. Refurbished items are not eligible for financing or leasing.
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