Checking Power Source Circuit

The field coil excites the stator coil, which generates charging current.

TEST
1. Turn the ignition switch "ON".
2. With ignition switch "ON" (but engine off), ensure the charging indicator lamp is illuminated.




3. Disconnect the pre-excitation resistor connector.
Connect an ohmmeter between terminals 1 and 3 (component side). Connect the (+) lead wire of the ohmmeter to terminal 3 and the (-) lead wire to terminal 1.

CAUTION: If the leads of the ohmmeter are not connected properly, there will be no reading on the ohmmeter. Be sure to connect the leads correctly.

RESULT
1. If there is continuity throughout steps 2 and 3, then the circuit is OK.
If there is continuity throughout steps 2 and 3, then the circuit, not the battery, is faulty.
2. If continuity is absent in step 2 only, then the charging indicator circuit should be checked and repaired. If continuity is absent during step 3 only then the pre-excitation register should be checked and replaced. (Refer to the circuit diagram).

NOTE: If continuity is absent in only one of steps 2 and 3, then the system is working normally. However, the individual circuit should be repaired for more reliable system operation.