Definitions for "Alternator Whine"
A siren-like high pitch sound that appears as the rpm of an engine increases. The noise is usually the result of a voltage differential created by more than one ground path or a poor ground path to the affected equipment.
A whining that is heard when the RPMs of an engine increase. The noise is usually the result of a voltage differential created by more than one ground path or a poor ground path (ground loop).