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How can I cool my alternator?

One way to keep your alternator cool is to build a simple fiberglass shroud that, when fed by a fan and ducting, will supply cool air to the alternator. The classic equation of heat transfer: Q=UAdT simply indicates that the amount of heat transferred per unit area increases directly with the difference in temperature.

Does alternator need cooling fan?

This current can be used to provide power to run different car accessories and recharge the car’s battery. This all process is heavy for the alternator and so it gets heated. To cool it down, alternators have fans, to help the circulation of air.

Why does water cool the alternator?

Instead of a fan, coolant from the engine’s cooling system passes through a water jacket in the alternator casing to keep the body and its sensitive electronics from heating up. Because the field coil is fixed around the rotor shaft, the Bosch liquid-cooled alternator needs no slip rings or brushes.

Do alternators have magnets?

Inside an Alternator Inside the alternator there are rotating magnets known as the rotor and the conductor wound in coils on an iron core called the stator.

How do I fix my alternator overcharging?

Undercharging is a more common issue, but it’s also possible for the alternator to overcharge, which can lead to a series of electrical failures. Alternator overcharge is caused by a defective voltage regulator, and the only solution is to have the alternator refurbished or replaced.

Can bad battery cause alternator overcharge?

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Additionally, an incorrect replacement battery in the vehicle can cause an overcharging condition. This happens in newer vehicles with alternators that need signals from the vehicle’s electronic control unit.

Is 15 volts too high for alternator?

Higher than 15 volts indicates a fault in the charging system’s voltage regulator or related circuits. If it’s substantially excessive, this can cause electrical system and/or battery damage. You mentioned your voltmeter runs at about 15 volts most of the time.

Will a bad alternator drain a battery when the car is off?

But when the engine is off, the alternator can’t recharge the battery, allowing little electrical mishaps to drain your battery entirely. The battery strain caused by these electrical whoopsies is known as a parasitic draw.

How much AC voltage does an alternator produce?

The actual output voltage produced by the alternator will typically be about 1-1/2 to 2 volts higher than battery voltage. At idle, most charging systems will produce 13.8 to 14.3 volts with no lights or accessories on.

Does the alternator start the car?

What the Battery & Alternator Do. An auto battery supplies a big electric charge that travels through the starting system and turns some gears to start the car. Once the car is running, the alternator sends current back to recharge the battery as you drive.