The real problem here was voltage stability under a brutal electrical load. In the monster truck, rear steer pulled battery voltage down near 10 volts, which gets too close to the point where an ECU can shut off. That means the alternator, battery capacity, and cable strategy all matter. The 370-amp Mechman Elite Series alternator was chosen because it delivers the output needed in a more compact package than a larger 500-amp unit. Its six-phase design, 12-diode rectification, and internal cooling fan are all about making high output more manageable by spreading heat, improving cooling, and reducing the horsepower required per amp produced. Just as important, it is a regulated system, so it only pulls the power needed to satisfy electrical demand. The wiring side is just as serious as the alternator itself. Large charge and ground cables, including a dedicated ground back to the battery, eliminate the weak links you get when current has to fight through brackets, paint, or corroded chassis grounds. When the electrical load is extreme, that full-circle path is what keeps voltage where it belongs.
The video opens with Banks examining a 370-amp billet alternator intended for the Monster Mutt Dalmatian project. The need for it came from earlier testing, when the team wanted to fully fingerprint the truck's behavior with a comprehensive iDash data-logging setup. After instrumenting the vehicle in Azusa, they took it to San Jose, where Cynthia drove it hard enough to expose a serious electrical weakness.
During rear-steer operation, battery voltage dropped dramatically, nearly to 10 volts. That was alarming because the engine management system depends on adequate voltage headroom to stay alive. Banks notes that fuel-injection pulses can stop at roughly 7 volts, so seeing the system sag that far under load suggested a real risk: if the batteries were already somewhat depleted and the driver held a long donut while using electric rear steer, the ECU could shut off and kill the engine. That made a higher-output alternator, along with additional battery capacity, part of the plan.
To solve the problem, Banks turned to MECMINN in Knoxville, Tennessee. The company is described as a builder of serious alternators for competition use, but also one that produces units for a wide range of applications. What stood out to Banks was that, much like a custom engine shop, MECMINN custom-builds and tests its alternators in-house.
The alternator shown in the unboxing is a compact 370-amp billet unit. Banks points out the CNC-machined lettering in the housing and the substantial overall construction, emphasizing that it feels like a heavy-duty piece rather than a typical parts-store replacement. The case clocking can be changed in 90-degree increments, allowing the relationship of the housing and terminals to be repositioned for installation. The battery and ground terminals are also notably large, reinforcing that this is intended for very high current service.
Banks also gives some background on the company's roots. MECMINN traces back to Dennis Moore, a mechanical engineer living in the high desert near Finland around 1978. Moore became known as the "mechanical man," which led to the MECMINN name. The company was started in 1978 and later moved to Knoxville, Tennessee, in 2008.
Although Dennis Moore no longer owns the company and is described as semi-retired, Banks says he still comes in to work on stators for the 500-amp alternators. That detail is presented as a sign of both the founder's continued involvement and the specialized nature of the products.
Banks explains that the team did not choose MECMINN's larger 500-amp alternator. The reason was not lack of interest in output, but packaging and system simplicity. The 370-amp model provides the output they need in a more compact form, while the 500-amp version uses an external voltage regulator.
For this application, the 370-amp alternator offered the better overall package. It met the truck's charging demands without the added complexity and size penalty of the larger unit.
A major technical distinction between this alternator and a conventional replacement unit is its six-phase design. Banks contrasts it with the typical three-phase alternator found in most vehicles. He notes that the phase timing involves some non-intuitive engineering, but the key point is that this is not a standard architecture.
The rectification hardware is also upgraded. Instead of the usual six diodes, this alternator uses 12 large diodes. That spreads heat over more components and improves cooling. The cooling fan is internal and sculpted in a way Banks compares to a turbocharger compressor wheel. According to his explanation, that fan design reduces the horsepower required from the crankshaft to cool the alternator. He also states that the six-phase arrangement requires less horsepower per amp produced, which he ties to improved efficiency and potentially better fuel economy.
Banks addresses an obvious question: if the alternator is rated at 370 amps, why does it not always consume dramatically more horsepower than a smaller unit? His explanation is that alternators are regulated devices. The 370-amp figure is the maximum capacity, not a constant load.
In operation, the alternator only pulls the power needed to supply the amperage being demanded by the electrical system. Under a given electrical load, it will not consume more crankshaft power than necessary simply because it has a higher maximum rating. In other words, the larger alternator has more available output when needed, but it is still demand-oriented through the regulator.
The video then shifts into alternator speed and pulley ratio. Banks uses a simple example: a 6-inch crankshaft pulley driving a 2-inch alternator pulley yields a 3:1 ratio, calculated by dividing the drive pulley diameter by the driven pulley diameter. With that ratio, a 600 rpm engine idle turns the alternator at 1,800 rpm.
He describes 1,800 to 2,000 alternator rpm as a baseline idle range where alternators are just beginning to come alive. For this MECMINN unit, output is about 50 amps at 1,800 shaft rpm and about 180 amps at 2,200 shaft rpm. By 6,000 alternator rpm, it reaches its full 370-amp peak output. The unit can safely spin to 20,000 rpm, which Banks notes is far beyond what many alternators can tolerate.
He then applies those numbers to real engines. In a diesel application with a 3,000 rpm engine redline and a 3:1 pulley ratio, the alternator would see 9,000 rpm, comfortably within the range where full 370-amp output is available. In a gasoline V8 turning 6,000 rpm with the same ratio, alternator speed would be 18,000 rpm, still within the unit's operating range. The practical goal is to choose pulley sizing that keeps alternator speed roughly between 1,800 rpm at the low end and 20,000 rpm at the high end.
Banks closes by focusing on wiring, and the cable size underscores how serious this alternator is. He contrasts it with the much smaller charging wire found on older vehicles, such as the number 10 wire he remembers from his 1963 Corvette. By comparison, the cable for this installation appears to be 1/0 or possibly 2/0 battery cable.
Just as important, the negative side is treated with equal seriousness. Rather than relying on the alternator to ground through its mounting bracket, painted surfaces, the frame, or potentially corroded engine-to-frame connections, MECMINN provides a dedicated boss on the alternator body for a true ground cable run directly back to the battery. Banks emphasizes that the electrical circuit must make the full round trip, and that a poor ground path undermines the entire system.
He notes that copper-clad aluminum cable can work, but the recommendation is 1/0 cable. Looking at a wire-gauge chart makes clear how different that is from the wiring most hot rodders are used to. The size of both the charge and ground cables makes it obvious that this is not an ordinary alternator, but a high-output charging component intended for a demanding competition vehicle.
With the unboxing complete, Banks frames the alternator as one part of a larger system being developed for the twin-turbo, supercharged monster truck engine. The unit is headed to the team building the billet front-drive arrangement, where it will be integrated into the accessory drive package.
The recap ends by positioning the alternator as a practical response to a data-logged electrical problem rather than a novelty part. The truck's rear-steer load exposed a voltage stability issue, and the 370-amp MECMINN billet alternator was selected because it offers the required output, compact packaging, robust internal design, and the wiring provisions needed to support a reliable high-current charging system.