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The Mechman 400 Amp is a high-output alternator for 1996–2004 GM trucks and SUVs, built for big electrical loads: winches, audio systems, lights and accessories. It uses six-phase technology with twin rectifiers and 12 large diodes, and Mechman rates it at 200+ amps at idle and 400+ amps at cruising speed, hot rated. It is a direct plug-in for trucks with the common oval 4-pin plug, but it needs a shorter drive belt and is not meant for sustained engine speeds above 5,000 RPM. It suits owners who have outgrown a stock alternator and want strong idle output; it is not a drop-in for every truck or a fit for high-RPM use.
In stock
Availability unknownSold by bigjeffaudio (99.6% positive, 34,100 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknownSold by bigjeffaudio (99.6% positive, 34,100 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Lowest price we've seen: $699.00 on Nov 8 at Alternator Outlet. Tracked across 1 store since Nov 8.
Owners rate it 5 out of 5 across 100 ratings, praising the output and build. The main complaints are installation details: the shorter belt and the occasional adapter harness.
This is a 400 amp alternator for GM trucks from 1996 to 2004, part of Mechman's Elite series. It has a green billet finish. It uses 6 phase technology with twin rectifier assemblies and 12 large diodes, and is built for durable daily use.
The alternator produces 200+ amps at engine idle RPM and 400+ amps at cruising speeds, hot rated. It is not recommended for sustained use above 5,000 RPM engine speed.
It plugs directly into trucks originally equipped with the common oval shaped 4 pin plug. A rectangle to oval adapter harness may be needed if the vehicle came with the factory CS144 heavy duty charging option, which is not common. The smaller 1.75 inch pulley requires a drive belt 1/2 inch to one inch shorter than stock in most applications.