What causes an alternator to put out high voltage?

If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty. Other potential problems are a faulty voltage regulator or a problem in the charging system wiring.

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.

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.

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.

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.

Normal charging on these is 14.5 to 15 volt, any meter could vary enough to get the 15.2. Meaning No problem.

For some alternators, it’s normal to see as low as 13 volts. For some, a constant 13.6 volts Is an indication of a problem. For others, it’s normal to see as high as 16 volts for long stretches. Still, it’s perfectly normal for others to see the alternator not charge at all intermittently.

You can also overcharge your battery with human error – that is, by not knowing how to use car battery chargers, using amp settings that are too high, or setting an incorrect voltage. If you have left your car battery charger unattended overnight, you can also overcharge it, which can cause damage to your battery.

You can also overcharge your battery with human error – that is, by not knowing how to use car battery chargers, using amp settings that are too high, or setting an incorrect voltage. If you have left your car battery charger unattended overnight, you can also overcharge it, which can cause damage to your battery.

So, to answer your question, Yes, 15 volts is too high. Most car alternators, that normally recharge your battery after every start, and provide power while the engine is running, are normally voltage regulated to about 13.8 to 14.0 volts.

And it basically operates off of supply and demand. That is, your alternator will only supply the amount of amperage a particular component demands—and no more. So High-output alternators will not harm your components or charging system, no matter how high you go with the amps.

When your battery voltage becomes too high, You can fry your vehicle’s system. Car computer systems are directly affected by the battery. With the high voltage causing inconsistent charges to the entire car, the computer system can be damaged.

Voltage Surge

The main cause of these voltage surges in power system are due to Lightning impulses and switching impulses of the system. But over voltage in the power system may also be caused by, insulation failure, arcing ground and resonance etc.

Q: At what voltage is a car battery fully discharged? A: A car battery can be considered to be empty when it is less than 10V. There is very little energy available between 10V and 0V, and the battery is damaged when discharged Below 10V.

14.5-14.6 is normal voltage While the alternator is running.

Assuming the alternator, engine, belt, and battery are all in working order, then Yes, a car battery will charge when idling. The only caveat is that it doesn’t really “charge” that fast. This is solely due to the fact that the engine doesn’t have a load on it when your car is simply idling.

As most rodders know, alternators have greater output at higher speeds. This increase in output is not linear but is actually a curve. This means that As rpm changes, the alternator will increase and decrease its output at different rates.

They can be faulty because of a variety of reasons: Incorrect wiring, or mislabeled charges Are the most common causes. These faults will translate to an overcharged car battery easily, as the charger starts supplying either the wrong amount of electricity or using the wrong charges to do so.

The build-up of hydrogen gas from an overcharging alternator causes your battery to swell. This also causes the battery to leak highly flammable liquid electrolyte, which is very dangerous. Please see a specialist right away if you notice this happening.