No-Load Check

WARNING: This page is about a different car, the 2003 Suzuki XL-7, 2003 Suzuki Vitara, and 2003 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

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 at 68°F (20° C) for 70A alternator or 14.2-14.8 volts at 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 (70A)

Courtesy of SUZUKI OF AMERICA CORP.

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 2000-2500 rpm soon after starting engine.
Read maximum value on ammeter immediately. If current is less than 49A (70A model) or 56A (80A/105A model) repair or replace the generator (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 (80A/105A).

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

Courtesy of SUZUKI OF AMERICA CORP.