alternators need to have a voltage regulator wired into the circuitry of a car, as the output from an alternator increases as the speed of the engine increases. Once the output reaches a certain voltage – usually 12 volts – the regulator cuts in and main- tains the required voltage. Older Corvettes (prior to 1969) were fitted with external regulators, but most alternators available from aftermarket stores have internal regulators. However, you can put an internally regulated alternator in your older Corvette and simply by-pass the existing external regulator. You’ll get a lot more voltage generated and higher overall reliability to boot. It’s not a difficult conversion to perform. We procured our aftermarket alternator, a 100-amp chrome Powermaster unit, from Corvette Central, and the SI alternator conversion kit from Lectric Limited. Here’s how to do the conversion.