- do not allow the generator to operate with the battery disconnected;
- do not check the generator for "spark", since in this case a significant current flows through the diodes, and they fail;
- do not test diodes with voltage greater than 12 V or with a megohmmeter;
- when carrying out electric welding work, disconnect all wires from the generator and from the battery;
- check electrical equipment components and circuits and troubleshoot problems when the engine is not running and the battery is disconnected.
CAUSE | METHOD OF ELIMINATION |
When the ignition is turned on, the battery charging indicator light does not light | |
Broken wire between generator, ignition switch and indicator lamp | Check the voltage along the circuit, starting from the generator |
The battery is discharged | Check the voltage and charge the battery if necessary |
The light bulb burned out | Replace the light bulb |
Generator brushes do not fit tightly against the slip rings | Check the length of the brushes and their freedom of movement in the holder |
The generator excitation winding burned out | Check the rotor and diodes, which, if defects are detected, must be replaced |
Battery charge indicator light does not go out when engine speed increases | |
The voltage regulator has failed | Replace with a new one |
The wire between the generator and the test lamp has contact with ground | It is necessary to replace the wiring harness or additionally insulate the wire |
The battery charge indicator light is on when the ignition is off | |
Diode short circuit | Check the diodes and replace the faulty one |
(Information for this article was taken from the website: FORDBOOK.ru)