Gotta G3 Hemi-Swapped Mopar? Keep It Juiced With a Powermaster Alternator

If your classic Mopar is anything like David Kruk’s 392 Hemi-swapped 1970 Super Bee, you’ve got an array of power-hungry electrical components that make running the right alternator crucial to keeping the lights on (and much more!). Thankfully, Powermaster came to the rescue, suggesting their 841574-1 single wire model, specially designed to fit perfectly in the factory location of the 6.4 Hemi engine.

Designed to look just like the factory Denso case, the Powermaster produces 12 volts and 175 amps; comes with a natural aluminum casting and uses the factory 6-rib serpentine pulley. This means you won’t have to deal with complicated custom modifications or large brackets to make it fit. Now keep in mind, that it might be a tight squeeze if you’re running this in a B-body swap, and you may need to notch the frame rail slightly for clearance.

This alternator features a convenient one-wire setup, making it an ideal solution for all 5.7, 6.2 Hellcat, or 6.4 G3 Hemi engine swaps operating off aftermarket management systems. Many have attempted to control a factory-style G3 alternator with the old-style Chrysler voltage regulator and harness plug, which can lead to erratic results.

Why? Because G3 Hemi factory alternators rely on pulse-width modulation controlled by the factory PCM. Some barely worked, others overcharged, and some didn’t charge at all. The 841574-1 is internally regulated, eliminating these problems and delivering precisely the charging output your electrical system requires. To ensure reliable power delivery, a minimum of an 8-gauge power lead is recommended, with a larger cable required for longer distances from the power source such as the trunk.

The 841574-1 has a small case with an approximate diameter of 4 3⁄4-inches, making it a little smaller then the factory alternator and easier to fit into your engine bay. Best of all, Powermaster alternators are proudly made in the USA, ensuring top-notch quality and craftsmanship. This alternator can be purchased at many retailers like Motorstate Distributing, Summit Racing, or JEGS.

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David Kruk

David grew up around classic cars, buying his first Mopar when he was 18 and has been addicted since. He currently has a 1970 Super Bee that he drives daily and competes in autocross and road course racing. He loves doing events like Power Tour, Moparty, SCCA, and Motor State Challenge.

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