Do you have to take the alternator out to get it tested?
Most service stations can test an alternator, but they will charge you for the labor. Many auto parts stores will test alternators, starters and batteries for free, though you will have to remove the alternator to have it tested at an auto parts store.
Where can I have my alternator bench tested?
AutoZone will test your car’s parts for free. We can test your car’s battery*, alternator*, starter* and voltage regulator while they’re still on your car.
When do you need to bench test an alternator?
Bench testing an alternator on a test stand should verify whether or not its output is within specifications. If the unit tests bad, your customer needs a replacement alternator. But if the unit tests good, the problem is something else such as a bad voltage regulator, PCM or wiring harness.
Why does AutoZone test the alternator and charging system?
Keep in mind, when you test your charging system while the car is running, or AutoZone does the same, the system voltage is being tested at the battery, and if it’s not getting a charge, the test cannot determine why. Either the alternator itself is at fault, or the wiring between it and the battery are.
Can you test an alternator on a boat?
What amazes me is why electrical engineers and engineers don’t test alternators on the boat where sometimes the fault lies in other areas than the alternator itself . Before you do that, you need to excite it otherwise it won’t charge by wiring a bulb across the warning light terminal.
How can I tell if my alternator is bad?
To check for a bad alternator diode, you may want to reset your voltmeter to the lowest possible AC voltage scale setting. Have your assistant start the car’s engine and let it run for a few minutes at 1200 RPM. Connect the voltmeter probes on their respective battery terminals. You should read “0.00” in the display.
Can You bench test an alternator at AutoZone?
If everything appears fine, the alternator should be removed and bench tested, which can be done for free at AutoZone. What if the Alternator Tests Fine? Electricity is frustrating, or at least it can be.
Why do I need to test my alternator?
Either the alternator itself is at fault, or the wiring between it and the battery are. Either case, the alternator will need to be removed, tested, and the wiring and fuses related to the circuit checked as well.
Can a worn alternator cause a voltage drop?
A worn, loose, or damaged connector can cause a massive voltage drop. If everything appears fine, the alternator should be removed and bench tested, which can be done for free at AutoZone. What if the Alternator Tests Fine?
What should voltage be between battery and alternator?
Very low differences in voltage between the battery and alternator should also be suspect – say – 12.8 volts at the battery. The first course of action is to check the wiring carefully that runs between the alternator’s main power wire and the battery.