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.
- What causes high charging voltage?
- Why is my alternator putting out 18 volts?
- Is 15 volts too high for alternator?
- What causes a charging system to overcharge?
- Is 15V to high for an alternator?
- Is 16 volts too high for an alternator?
- Is 14.7 volts too high for alternator?
- Why is my alternator putting out 17 volts?
- What causes an alternator to put out High Voltage?
- Is 14.8 volts too high for alternator?
What causes high charging voltage?
A stuck closed voltage regulator typically causes high charging system voltage. Voltage regulators adjust output voltage according to the demands of the electrical system. In late-model vehicles, this is accomplished through a sensing circuit that informs the PCM of battery temperature and electrical system demands.
Why is my alternator putting out 18 volts?
18 volts is a bit high. It is possible that your rebuilt alternator has a faulty regulator.
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.
Symptoms Of An Alternator Overcharging The Battery Causes
What causes a charging system to overcharge?
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.
Is 15V to high for an alternator?
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.
Is 16 volts too high for an alternator?
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.
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Is 14.7 volts too high for alternator?
To fully charge in reasonable times, alternator output must be 14.2 V to 14.5 V as measured right across the battery posts. Above 14.5 volts charging voltage, batteries have a greatly increased tendency to release excessive acidic vapors, hydrogen gas, and to corrode things around the battery.
Why is my alternator putting out 17 volts?
It may be that the regulator is packing up and the alternator is going to max. unregulated output because of a bad battery output voltage (alternator input) connection between the battery and the alternator.
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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.
Is 14.8 volts too high for alternator?
14.8 would start to be a worry (there might be liquid or corrosion on the battery) and 15 volts would be a real concern, but 14.6 is fine. Less than 14.3 would be a "weak" alternator or regulator. Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link.