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 maximum

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 And Temperature Chart

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 below or in standard value
If voltage is lower than standard value, proceed to the following check.
- Ground "F" terminal and start engine, then measure voltage at "B" terminal as shown in the figure.
  
  Fig 2: Measuring Generator Voltage
  Courtesy of SUZUKI OF AMERICA CORP.

Voltage is higher than standard value:

It is considered that generator itself is good but IC regulator has been damaged, replace IC regulator.

Voltage is lower than standard value: