When it comes to building or working on our trucks, there're always a few gremlins that sneak into the mix along the way. One frustrating malady is a malfunctioning or inadequate charging system. Having to jump-start your truck nearly every time you shut it down is about as aggravating a problem as you can experience. With this in mind, we're going to take a look at alternators as the foundation of a charging system, and while we're at it, introduce you to one new and exciting product from Powermaster Motorsports that's been designed specifically for resto- or period-style trucks: the new PowerGEN alternator.
Retro Meets Techno
Perhaps the new PowerGEN's most exciting aspect is that it provides the looks of an early-style generator with the output and reliability of a modern alternator while offering the ease of one-wire installation and operation. Powermaster engineered the PowerGEN from the ground up to be completely brand new, and high-tech engineering and materials are used throughout its manufacture.
The initial PowerGEN's success was overwhelming. The traditional hot rod crowd (a huge and continuously growing segment of the hobby) had been waiting semi-patiently for someone to successfully develop the perfect finishing touch in their quest for true retro engine styling. Powermaster heeded their call, and we can reap the rewards as well. In the short time since the PowerGEN's introduction, the company has developed and introduced four additional applications, including the GM long and short styles, the Ford swing mount, and the '49-and-up Ford Flathead-all with an output of 75 amps max and 60 amps at an idle. The PowerGEN is an awesome addition to any traditionally styled hot rod or street rod. That said, let's get to some tips regarding alternators and charging systems of any style.
Alternators-What We Need To Know
For most of us, the only alternator identification we're familiar with is the amperage rating. Alternators are commonly referred to by their ratings-for example, as a 65-amp or 100-amp alternator. When replacing the alternator in a stock truck, this is probably the only information necessary. After all, all one needs is an alternator that matches the original. The following is a compilation of information from the pros at Powermaster that'll give us a much greater understanding of our charging systems and the info we'll need to keep our pickups electrically reliable and trouble-free.
When building a truck from the ground up, however, a deeper understanding of an alternator's power curve is required. Often, the aftermarket custom pulleys, or so-called "power pulley" sets, are used in conjunction with a performance alternator. A mismatched pulley ratio and alternator will spell trouble, especially at idle speeds where alternator performance is critical. To avoid this, it is important to understand the alternator's capability at slow speeds.
 |  Powermaster not only manufactures...  Powermaster not only manufactures OE-style cast and black traditional-looking PowerGENs, but they also added some flash for those who want a bit more eye candy. This rear shot of the #282051 is the polished version of the up-to-'64 GM long style. |  This one's got the look we've...  This one's got the look we've all been waiting for-the black and cast Ford offset style. The one pictured here is #82101 and fits all '51-58 Fords and '60-64 V-8s. |