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No-Load Check

Run engine from idling up to 2000 RPM and read meters.
NOTE: Turn off switches of all accessories (wiper, heater etc.).

Specification for undercharged inspection

Current: 10 A

Voltage (at 20 °C (68 °F)): 14.2-14.8 V

NOTE: Consideration should be taken that voltage will differ somewhat with regulator case temperature as shown in the figure.

Fig 1: Voltage Graph
Courtesy of SUZUKI OF AMERICA CORP.

If voltage is higher than standard value
If voltage is higher than standard value, check ground of brushes.

If brushes are not grounded, replace IC regulator.
If voltage is lower than standard value
If voltage is lower than standard value, check rotor and stator, rectifier, brushes, regulator.