What important aspect should be monitored in the starter-generator to ensure proper operation?

Monitoring wear on the commutator and brushes is critical for the proper operation of a starter-generator because these components are essential for the electrical contact that allows the generator to produce electricity and for the motor to start the engine. The commutator has segments that come into contact with carbon brushes, and wear over time can lead to poor electrical contact, increased resistance, and potential failure of the starter or generator function. Proper maintenance and monitoring of these components can ensure reliable starting and efficient operation of the generator, ultimately contributing to the overall performance and longevity of the engine.

While aspects like voltage thresholds, fuel efficiency, and temperature regulation are important in other contexts of engine operation and performance, they do not directly relate to the health and efficiency of the starter-generator in the same way that monitoring wear on the commutator and brushes does. Thus, focusing on the wear of these components is vital for maintaining functionality and preventing unexpected breakdowns.