Content

• Advice
• Warning

• Turn off the car engine. You must turn off the car engine before connecting the voltmeter.
• Open the bonnet.
• Connect the voltmeter to the battery. Clip the red end of the voltmeter to the positive terminal of the battery, clamp the black end to the cathode. Avoid touching the batteries with your hands.
• Read the measurement on the voltmeter. If the voltmeter is just above 12.2V the battery is strong enough to spin the generator, then you can test the generator with a voltmeter.
• If the battery does not have enough voltage, you must charge it and check it again, or use another method to test the generator.

Start the car and increase the throttle so that the engine reaches 2,000v / p. This step draws electricity from the battery, causing the regulator to activate the generator running at high speed.

Continue to run the engine and recheck the battery with a voltmeter. Now when you read the voltmeter the voltage should be increased by at least 13V. If changing the number of revolutions causes the voltage to fluctuate between 13 and 14.5V then the generator works well; on the contrary, if the voltage does not change or decrease then the generator is having problems.

• Repeat this process with the lights, radio, and car accessories on. Generator is charging if battery voltage remains above 13V with engine speed of 2,000v / p and all accessories are running.

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Method 2 of 2: Track generator

1. 

   Check with voltage / current meter. If you have a voltage / current meter, it will help you measure the generator output voltage. Run the engine at 2,000v / p to check and turn on the air conditioner or heater blower, and turn on all the car's accessories, then monitor the meter to see voltage or amperage. to reduce or not. As a rule, if the voltage while the engine is running is higher than when the engine was stopped then you can definitely say that the generator is charging the battery.

2. 

   
   
   Listen to the generator while the engine is running. If there is a problem with the bearing, you will hear a hissing sound coming from the front of the vehicle, and it will be louder when there are more than one electrical device in the vehicle working at the same time.

3. 

   Turn on the radio and press the gas hard. Tune the radio to a low frequency on the AM band while there is no music. If the radio makes a shrieking noise or a hum each time you press the gas, the generator is more likely to be the culprit.

4. 

   
   
   Find auto parts stores that help test free generators. Since every store wants you to buy their new generator, try to compete with the competition by offering a free test service. You can unplug the generator and have it tested. advertisement

Advice

• Even if you conclude that the generator is broken, the problem could still originate elsewhere. Examples are broken fuse, damaged relay, defective lead or regulator.
• When the weather is very cold, turn on the headlights for a minute or two before starting your car, then turn off. The warm battery will make it easier to start the car.

Warning

• Some people advise checking the generator by starting the car, loosening the negative wire of the battery and waiting to see if the engine turns off. Don't try this method; It can heat up regulators, generators and / or electrical components.
• Avoid letting your hands, clothing, long hair, and jewelry touch moving parts when checking under the bonnet.