Quick Answer: What Would Cause A Good Alternator Not To Charge?

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..

Can a completely dead battery be recharged?

While your vehicle’s alternator can keep a healthy battery charged, it was never designed to completely recharge a dead car battery. … With a seriously depleted battery, your best option is to connect it to a jump starter or a dedicated battery charger either before or immediately after a jump-start.

What can cause battery not to charge?

Here’s a quick rundown of some of the most common causes of a battery that won’t hold a charge: You’ve left your lights on, or some other accessory that draws battery power even when your car isn’t running. … There is a parasitic electrical drain on the battery, possibly caused by a bad alternator.

What are the signs of a bad alternator?

6 Symptoms of a Failing AlternatorThe indicator light. … Headlights are dim or flickering. … Other electrical failures. … Strange noises. … Car stalls or has difficulty starting. … Battery dies.

Can an alternator be bad and still charge?

If it’s still sending out a strong charge, the battery is likely not the problem. It’s important to note that once an alternator goes bad the electrical devices will attempt to draw power from the battery, which in turn could cause the battery to die more quickly.

What causes a car not to start if the battery is good?

In order to start your car, you need a high current. … First, the starter can crank but the car will not start. This is usually due to battery failure, which is due to something being left on and causing the battery to drain. It could also be due to poor connections, damaged battery terminals, or a bad or dead battery.

How do you know if it’s your battery or alternator?

Some of the things to look for are no-starting and trouble starting, dimming lights and problems with stereo system output. If your car starts but stalls when you’re underway, your battery is probably not being recharged due to a faulty alternator.

Can a bad alternator destroy a new battery?

A bad alternator will cause a battery to lose its power because an alternator charges the battery while a car is running so that all your electrical systems on the car will work. It can if you let the new battery run down. … Also allows battery current to drain when the car is shut off.

What would cause a new alternator not to charge?

Bad Battery The most obvious reason why your battery won’t charge when your alternator is brand-new is that the problem is with the battery itself. … If you’re getting less voltage than that, then your battery is not able to hold a proper charge.

How do I fix my alternator not charging?

Check the large power cable to the alternator and the fuse, usually a large 40-60 amp fuse located near the battery. Check the ground cable between the engine and the body. Check the serpentine belt and make sure the alternator is spinning with the engine. Check the small power supply wire and the charging light wire.