Hairpin units are commonly called 6 phase. They produce more output at idle and are more efficient than a conventional alternator. JS Alternators hairpin units feature premium bearings to withstand high engine rpm and utilize dual plate rectifier with 12 heavy duty diodes for improved cooling. Hairpin Units are a more reliable alternator to withstand high heat, high demand for your racing applications
The alternator is compatible with the factory 2010-2021 Ford Mustang 5.0L alternator bracket and other Ford brackets. This unit is a direct fit for engine swaps on 2010 and newer 5.0L Ford Mustang Coyotes which makes for an easy installation. To turn the alternator on and off with the ignition switch, simply connect a single wire from the provided pigtail to any ignition-switched 12V+ source. This unit is for a racing application, every 250amp alternator will automatically come with the OEM size pulley unless specified in your order notes.
All Motor Swap Applications will come with a 45 mm. pulley and will require installing a 1/2 inch - 1 inch shorter belt.
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JS Alternators
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