Alternator

Little/no charging but alternator and battery test good

Little/no charging but alternator and battery test good
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  • Vovich Mechanicovich
  1. Can an alternator test good and still be bad?
  2. Why is my battery light still on after replacing battery and alternator?
  3. Is there a fuse between alternator and battery?
  4. What are the symptoms of a bad voltage regulator?
  5. Can a bad alternator destroy a new battery?
  6. How do I know if my alternator has a bad diode?
  7. Why is my battery light on when I just got a new battery?
  8. Why is my battery light on if I just got a new battery?
  9. Can a blown fuse cause battery light to come on?
  10. Is there a fuse or relay for the alternator?
  11. What would cause a good alternator not to charge?

Can an alternator test good and still be bad?

The only way to know if an alternator is good or bad is to bench test it on an alternator test stand. Charging output can be tested on a vehicle with a digital voltmeter. ... If an alternator can produce normal voltage and current during a bench test, the problem is not the alternator but something else on the vehicle.

Why is my battery light still on after replacing battery and alternator?

Hello. It is possible that the problems that you have been experiencing with the bad alternators have damaged the battery causing it to be weak. This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.

Is there a fuse between alternator and battery?

There are 2 fuses for the alternator. One is usually a fusable link (wire) for connecting the stator diodes to the battery, and a lower value fuse (10 to 30 amp) for protecting the field (rotor). ... The last possibility is the wire from the fuse to the regulator or field terminal shorted to the body of the car.

What are the symptoms of a bad voltage regulator?

Usually a faulty instrument voltage regulator will produce a few symptoms that can alert the driver of a potential issue.

Can a bad alternator destroy a new battery?

Can a bad alternator kill a new battery? Yes, very easily. A failing alternator can overcharge, which will damage the battery. An undercharging alternator will leave the battery flat, which speeds up its failure.

How do I know if my alternator has a bad diode?

Usually, a bad alternator diode will cause your headlights or instrument panel lights to flicker or dim and, sometimes, drain battery power overnight, or in minutes. * To check for a possible bad alternator diode, switch your voltmeter to a low setting on the AC (alternating current) voltage scale.

Why is my battery light on when I just got a new battery?

An illuminated battery light could be due to a number of issues, including: A loose or corroded battery cable. A problem with the alternator or voltage regulator. Damaged cells or plates inside the battery.

Why is my battery light on if I just got a new battery?

The battery warning light in most cars indicates there is problem with the charging system as a whole, not just the battery. ... The light should go out when the problem is repaired. It may not go out immediately though. You need to have your alternator checked.

Can a blown fuse cause battery light to come on?

If the battery light comes on and stays on while you are driving, the most common cause is a broken alternator belt. ... The other is a blown fuse or defective connector or relay, which could have been broken or shorted when the alternator was installed or on the first start-up after its installation.

Is there a fuse or relay for the alternator?

Although all cars don't have an alternator fuse in them, the vast majority of them do. Alternator fuses are put into place to allow an alternator to operate. They're small fuses found in the fuse boxes of cars that control alternators and help to keep them up and running.

What would cause a good alternator not to charge?

This means that you could have a weak alternator, or a poor connection at the battery terminals. You could also have a loose drive belt, which is what supplies power to the alternator itself. If the drive belt is loose or not working properly, the alternator will not charge.

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