A method and system for evaluating the operation of an alternator based on a frequency component in the alternator output signal. The method detects a frequency component of the alternator output signal, and compares the frequency component of the alternator output signal with a threshold frequency....http://www.google.ca/patents/US6806727?utm_source=gb-gplus-sharePatent US6806727 - Alternator testing method and system using ripple detection
