No-Load Check

WARNING: This page is about a different car, the 2007 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

Run engine from idling up to 5000 RPM and read meters.
NOTE: Turn off switches of all accessories (wiper, heater etc.).

Specification for undercharged battery (No-load check)

Current: 10 A

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

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

Fig 1: Generator Voltage Graph
Courtesy of SUZUKI OF AMERICA CORP.
Using service wire, ground "C" terminal (1) of generator.

Fig 2: Identifying Generator Ground Terminal
Courtesy of SUZUKI OF AMERICA CORP.
Measure voltage between "B" terminal of generator and body ground.
Voltage: 12.5 - 13.1 V (at 20 °C, 68 °F)

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, proceed to the following check.