The process of directly applying battery voltage to the field winding of an alternator to force maximum output is termed “full fielding.” This bypasses the voltage regulator, compelling the alternator to produce its highest possible voltage and current. An example is when diagnosing an alternator failure, this technique can quickly reveal if the alternator itself is capable of generating power, isolating it from regulator issues.
Employing this method serves a crucial diagnostic function, particularly in scenarios where charging system malfunctions are suspected. The practice allows technicians to quickly determine the alternator’s potential output capability. Historically, this was a common troubleshooting step on older vehicles with simpler charging systems; however, caution must be exercised on modern vehicles with sophisticated electronic controls, as excessive voltage can damage sensitive components.
