Recheck your connectors and system wires to ensure they are in good condition.Step 3: measure the charging system’s Load Voltage If the reading doesn’t change after checking, your alternator has a problem. This is done when the charging system passes the No-load voltage test. Restart the engine, and maintain a speed of 2000 RPM and switch on all accessories.The difference between this reading and the base voltage is the charging voltage of your system. The ideal charging voltage should be at least 0.5V higher than the base voltage.(13.1V to 15.0V). If your charging system failed the No-Load or Load test, you need to check your alternator’s voltage regulator.Ī higher or lower value than this signifies a faulty alternator.There are different designs for charging systems. ![]() Before you test the alternator voltage regulator make sure you consult your vehicle’s service manual. The manual will guide you on the type of tests you can do on your own. If tests prove that the alternator voltage regulator is bad, find a replacement online or in a local auto parts shop.An alternator voltage regulator that is faulty can cause charging problems.Internal voltage regulators found in late-model cars can also fail from high levels of heat.Reset the voltmeter to the lowest AC voltage scale setting possible.Restart the engine, run it for a few minutes at 1200 RPM.0.001) in the display points to a bad alternator diode. ![]() ![]() Here’s how to test without a voltmeter: Assess the Alternator belt drive condition You’ll need to replace the whole alternator because the diode cannot be replaced alone.Īlthough using a voltmeter gives an accurate report on your car’s alternator problems, it is not the only available way to test. The energy from the engine reaches the alternator through the drive belt. A loose or worn-out belt leads to charging problems. Listen for an unusual sound from your car’s engine.Īs your engine runs, listen for a loud clicking sound. Start the engine, the lights’ brightness may fade but go back to the original brightness after a while.Do a headlight testįor accurate results on the headlight brightness do this in a darkened environment. This means the alternator is charging your system properly.
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