How to Test When the Generator is Not Generating Electricity?

1 Answers
RosalieFitz
07/30/25 3:46am
Steps to test a car generator that is not generating electricity: 1. Rotate the multimeter knob to DC voltage 30V. 2. Connect the red probe to the generator's "armature" terminal and the black probe to the casing. 3. Run the engine at medium speed or higher. The standard voltage value for a 12V electrical system should be around 14V, and for a 24V electrical system, it should be around 28V. 4. If the measured voltage is the same as the battery voltage, it indicates that the generator is not generating electricity. The following are the reasons why a car generator may not generate electricity: 1. The diodes are broken and cannot perform rectification. 2. The brush is stuck in the brush holder, causing the generator to fail to generate electricity due to lack of excitation. 3. The rotor's field coil is not energized. 4. Short circuit or grounding between the stator coils. 5. The rotor's claw poles are loose.
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