Check the section "Troubleshooting for Unusual Charging System Voltage Drops" below to check for wiring problems that can lead to this condition. This fault could point to a faulty alternator or voltage regulator. Otherwise, the charging system can't meet the demand and charge your battery. Your reading should be at least 0.5 volts above base voltage for your system to keep up with electrical system demands. Take a voltage reading across the battery posts.But don't turn on the heated windshield if your vehicle has one alternator voltage may increase to over 100V and this can be unsafe. Turn on all electrical accessories like A/C, blower motor, headlights, defroster, wipers. Ask an assistant to start the engine and hold engine speed at about 2000 RPM.Measure charging system load voltage with a high-current-condition system measurement. As part of your wiring checks, see the section "Troubleshooting for Unusual Charging System Voltage Drops" below.ĥc. Other potential problems are a faulty voltage regulator or a problem in the charging system wiring. If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty. You should get 0.5 to 2 volts higher than base voltage. Measure voltage across the battery with your DMM.Ask an assistant to start the engine and hold engine speed at about 1500 RPM.Measure the Charging System's No-Load Voltage If you get a reading below 12.4V, charge the battery before continuing.ĥb. This means your battery is fully charged. Measure battery voltage across the battery posts with your DMM.Turn on the high beams for 10 seconds and then turn them off.First, measure battery base voltage to make sure you have a fully charged battery. You do this by measuring system voltage while loading the system.ĥa. The next three tests are best done using a load tester, but you still can use your digital voltmeter. Check for Under-Charging and Over-Charging If necessary, have your alternator checked.ĥ. Listen for whining noises (this can indicate a bad diode or an over-charging condition), grinding (bad bearing), squealing, or other abnormal noise.Place one end of the hose against your ear and move the other end around different points of the alternator body.
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