A diagnostic tool for testing the performance of a component of a vehicle may include a processor configured to process test information from an alternator of the vehicle and control and activate the alternator of the vehicle having identification information to be tested. The diagnostic tool may also include a memory configured to store the test information of the alternator and software that operates the alternator of the vehicle. The diagnostic tool may further comprise a removable modular component comprising an operational circuitry that allows for the diagnostic tool to operate, wherein the removable modular component is replaced based at least in part on a determination that the operational circuitry is faulty, wherein the memory and the removable modular component are in communication with the processor.