Checking the generator power circuit

The alternating magnetic field that occurs during the rotation of the generator rotor induces a variable EMF in magnitude and direction in the stator phase winding (AC voltage).

Verification procedure

1. Turn the ignition key to position «ON».

2. Be convinced that the control lamp of the category of the storage battery burns at the included ignition and the idle engine.

3. Disconnect the field resistor connector.



Connect ohmmeter probes to pins 1 and 3 (from the side of the resistor). Connect wire (+) ohmmeter to terminal 3, and the wire (–) ohmmeter - to conclusion 1 (pic. 7.9).

Attention! If the ohmmeter probes are connected incorrectly, the measurement result will be incorrect. Make sure the instrument probes are properly and securely connected.

Analysis of results

If the circuit is closed when the conditions of points 2 and 3 are met, then the circuit is OK.

If the circuit is open under the conditions of points 2 and 3, then the circuit is faulty, but the battery is normal.

If the circuit is open only when the conditions of paragraph 2 are met, then it is necessary to check and repair the low battery warning lamp circuit.

If the circuit is open only when the conditions of point 3 are met, then check and, if necessary, replace the field resistor.

Note. If the circuit is open only when the conditions for one of the points are met (2 or 3), the system will still work. However, the faulty circuit should be repaired in order for the charging system to work more reliably.