1991 Mustangs came equipped with a G2 alternator, as our first build was equipped with. While fine, the electric cooling fans used in a V8 conversion have a tendency to over-tax it a bit. We found on the test chassis that at night in the rain the cooling fans, lights and wipers would significantly drain the car's charging ability. In addition, the connections on the G2 were such that a large-gauge wire plug had to be almost welded to the Miata source wire to make the whole system work. The G2 also had a large external cooling fan that had a tendency to get a little too close to the upper radiator hose at times. On this build we chose to use an upgraded G3 alternator as would be found on a later model Ford Taurus. This unit almost bolted right in, uses the same belt, almost uses the exact same connections the Miata already has and, because Taurus' have electric cooling fans and quite a few accessories, will be able to more than handle the load of a V8 Miata.