What can cause a new alternator to fail?
Bad diodes are a common cause of alternator failure. The diodes are part of the rectifier assembly that converts the alternator’s AC output to DC. A leaky diode also can allow current to drain out of the battery through the alternator when the vehicle is not being driven.
What is replaced in a rebuilt alternator?
Rebuilding: A rebuilt alternator or starter had its worn parts discarded and replaced with new or remanufactured parts. A rebuilt system won’t have all its parts at the same state of wear and tear, but it’s an affordable alternative to buying a new alternator or starter.
Is a refurbished alternator good?
Rebuilt alternators can be up to 25 percent cheaper than buying a new alternator. One problem is that good quality in a rebuilt alternator means more money—the cheaper the rebuild, the more likely that the alternator will break again. As a result, it might be more cost-effective to simply purchase a new alternator.
How long does a rebuilt alternator last?
When people have their car alternator replaced, the expectation is that the repair will last at least as long as the expected life of the new alternator, four to five years or anywhere from 50,000 to 100,000 miles. Plus, like many auto repairs, replacing an alternator is not cheap.
Is it worth buying a new alternator?
New alternators If the budget allows, you should consider purchasing a new alternator made by reputable and trusted brands. Be wary of buying a new but cheap one as it can sometimes last just slightly longer than the warranty that comes with the product.
Can You rebuild an alternator that has already failed?
Only replacing a part or two in an alternator that has already failed may be no more than a temporary fix. Rebuilding an alternator is a more involved process. The alternator is dismantled and inspected.
What’s the least expensive way to replace an alternator?
A skilled repairperson might also replace parts that are near failure. This option can be the least expensive for the vehicle owner depending on the cost of the parts that need replacement. Only replacing a part or two in an alternator that has already failed may be no more than a temporary fix. Rebuilding an alternator is a more involved process.
How does an alternator change from AC to DC?
This rotor piece spins within a coil assembly known as a ” stator “, which contains wound copper coils. As the brushes pass by those stator coils, an electrical charge builds up. That charge is then sent from the coils through a voltage regulator and rectifier that converts it from alternating current (AC) to evenly-flowing direct current (DC).
Can a bad alternator be heard from inside the car?
If bearings are indeed the problem, you’ll be able to hear them over the sound of the engine. You may even be able to hear bad alternator bearings from inside the vehicle. Although not as common, an alternator on its last legs can produce an acrid burning smell.