How to Troubleshoot a Bad Alternator

The alternator is an essential part of any car. Its is used to maintain the battery's charge and replenish the voltage while the car is running. If you believe that the battery or alternator of the car are going bad, there are a variety of different ways that you can determine if the alternator is the source of the problem.

• Inspect the alternator to ensure that it is securely attached to the car and that all wires and bolts are securely attached as well. If there are loose wires or bolts on the alternator, this could be causing the alternator to malfunction. Tighten the alternator bolts and wires and see if this solves the problem you are experiencing.

• Check the voltage of the battery to see if it is within normal range using a battery tester. Attach this tester to the positive battery post and read the meter. The voltage on a battery that is fully charged should show at least 10 volts on the meter. If the reading is any lower than this, the battery’s voltage is not being sufficiently replenished by the alternator.

• Leave the battery tester attached to the car's battery and then turn on the car. Have someone read the battery tester while you give the car gas to increase the RPM reading. The voltage tester should show an increase in the amount of voltage, if you do not see an increase in the voltage then the alternator is not working properly.

• Inspect the alternator belt to ensure that it is in proper working order. If the belt is loose, frayed or broken this could be what is causing a problem with the alternator; the belt should fit snugly in place. Replace the belt if there are any signs of a problem with the belt.