How to Solve Low Voltage in Car Alternator?

1 Answers
OAna
07/30/25 9:29am
Remove the plastic cover of the alternator and use a multimeter to measure the six (or eight) diodes of the rectifier bridge. The resistance of the 28V alternator's excitation coil should not exceed 15Ω. If it's normal, proceed to the next step. Use a multimeter to measure the resistance between each of the three phase wires and the neutral point. The resistance values should be equal. If one shows significantly higher resistance, it indicates an open circuit in the coil. If all the above checks are normal, then remove the plastic cover to locate the voltage regulator and replace it with a new one of the same model.
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