No-Load Check

NOTE: Turn off switches of all accessories (wiper, heater etc.).

Run engine at idle up to 2000 RPM. Read meters. Amperage should be 10 amps (maximum). Voltage should be 14.4-15.0 volts @ 68°F (20°C) for 60A/70A alternators or 14.2-14.8 volts @ 68°F (20°C) for 80A/105A alternators.

NOTE: Consideration should be taken that voltage will differ somewhat with regular case temperature. See Fig 1 or Fig 2 .

Fig 1: Identifying Undercharged Inspection Chart (60A/70A)

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Fig 2: Identifying Undercharged Inspection Chart (80A/105A)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

If voltage is higher than standard value, check ground of brushes. If the brushes are not grounded, replace IC regulator. If voltage is below or in standard value,

Run engine at 2000 rpm and turn on headlight and heater motor. Measure current and if less than 20A, repair generator (60A/70A).
Ground "F" terminal and start engine. Measure voltage at "B" terminal (80A/105A). See Fig 3 .

If voltage is higher than standard value, it is considered that generator itself is good but IC regulator has been damaged, replace IC regulator. If voltage is lower than standard value, generator itself has problem, check the generator.

Fig 3: Grounding Generator "F" Terminal (80A/105A)

Courtesy of SUZUKI OF AMERICA CORP.