0
Mechman high output alternators · Authorized dealer
Hummer owners build for the trail and for the show: winches, rock lights, roof racks loaded with gear, and stereos that match the truck's presence. Every Hummer high output alternator on this page fits a 2003-2010 model, most with a GM V8 under the hood. Choose your model or use the vehicle finder to filter the grid by year and engine.
The Hummer H2 alternator page carries most of the selection, covering the 2003-2007 6.0L and 2008-2009 6.2L trucks. Because the H2 shares its V8s with GM full-size trucks, owners get the same wide spread of outputs and finishes. Diesel H1 owners have a smaller group of units on the Hummer H1 page, and 2008-2010 trucks with the 5.3L V8 are listed separately as well, so confirm your model, year and engine in the vehicle finder before ordering.
H2 owners who mount a front winch, light bars and an onboard air compressor often use them together on the trail, at low engine speed, which is exactly when a stock charging system falls behind. More output keeps the battery from draining during a long recovery or a slow crawl.
A 170 or 240 Amp Hummer high output alternator keeps up with a light bar and a modest stereo. 250 and 320 Amp suit a winch, air compressor and auxiliary lighting used together. 370 and 400 Amp are for overland rigs with fridges and inverters, or show trucks with competition audio. About seven in ten Hummer units use a billet housing, machined from solid aluminum, which holds up well to heat and vibration off-road. Finishes range from black and natural to chrome, polished, red, blue and more.
Mechman high output alternators should be paired with cable rated for the current: start with a Big 3 wiring kit, then add a battery from our batteries to handle winch pulls. If a plug or regulator change is needed, see harnesses and regulators. Hummer units sit alongside Chevrolet and GMC trucks on all GM alternators, and every make is on our alternator collection.
Shop Pay InstallmentsPay over time, powered by Affirm
Lease-to-own with SnapNo credit needed¹
Pay later with SezzleFlexible payment options
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.
Before you browse
We use cookies to run the store, to measure how it performs, and — only if you allow it — to show you our products on other sites. You can change your mind at any time. Read our privacy policy
Necessary cookies always run — the store cannot work without them. Everything else is your call.
Necessary
The cart, checkout, sign-in, fraud prevention and security. These cannot be switched off.
Preferences
Remembers your currency, region and recently viewed products.
Analytics
Measures how the store is used so we can fix what is broken and improve what is not.
Marketing
Lets us measure our advertising and show you our products on other websites. Turning this off also opts you out of the sale and sharing of your information for advertising.
