Is 14.7 Volts Too High?

Does alternator charge at idle?

Yes, the alternator does charge the battery while the car is idling – regardless of the load on the battery.

However, if your electrical use load (radio, lights, fan, etc) exceeds the amount of charge the battery is receiving from the alternator, you will end up with a discharged battery at some point..

Why is my alternator putting out 17 volts?

The desired full charge voltage is 14.2 Volts. … 17 volts is just about max unregulated output on a 12 volt alternator so I would suspect that the voltage regulator is defective or somehow not working correctly. To put things in less dramatic terms.

Is 14.8 volts too high?

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.

What should voltage be at idle?

At idle, most charging systems will produce 13.8 to 14.3 volts with no lights or accessories on (although some may charge at a slightly higher voltage depending on temperature, engine RPM, type of battery, and the battery’s state of charge).

Does an alternator charge all the time?

While the battery supplies the electricity needed for that initial spark, it only has enough power to get the car a few miles down the road, and that’s where the alternator comes in—it continually charges the car battery while the car is in motion while also simultaneously operating all the electronic components of the …

Can bad battery Cause High Voltage?

The heat can be overcharging your battery. These voltage readings depend to some extent on the battery type. If it was an AGM battery then the voltage readings would be normal and the relatively high charging voltage would also be normal.

How do I know if my alternator is overcharging?

Symptoms of Overcharging an AlternatorHigh Gauge Reading. An overcharging alternator will cause the voltmeter on the vehicle’s dash to read an overly high voltage that may or may not vary with engine speed. … Low Battery Electrolyte. … Burnt Bulbs. … Battery Heating. … Swollen Battery. … Seeping Battery.

What happens if voltage is too high?

Voltage that is too high can cause premature failure of electrical and electronic components (e.g. circuit boards) due to overheating. The damage caused by overheating is cumulative and irreversible.

What are the symptoms of a bad voltage regulator?

Symptoms of a Bad or Failing Instrument Voltage RegulatorDim or flickering gauges. One of the first symptoms of an issue with the voltage regulator is dim or flickering gauges. … Inaccurate or erratic readings. Another symptom of an issue with the voltage regulator is inaccurate or erratic readings from the voltage regulator. … Inoperable instrument cluster.

Why does an alternator 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 15 volts too high?

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.

What causes high charging voltage?

Charging voltage is too high means that the regulator is bad: It’s less common, but you may see that the charging voltage is too high, like over 15 volts. This means that the voltage regulator is stuck in the closed position.

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.

How much voltage is too much from an alternator?

Measure voltage between alternator frame and battery’s negative terminal. More than about 1/10 volt says there’s a “grounding” issue. Otherwise it is likely the alternator’s regulator. Take it to a parts dealer and they can generally check it.

Is 15 volts too high for 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. … Above this, and it will gas increasingly with increasing voltage.

Is 14.5 volts too high?

If the alternator is working well, your multi-meter should read somewhere in the vicinity of 14 volts (typically 13.8-14.2). If it is reading excessively higher than 14 volts (greater than 15 volts) it is possible that the voltage regulator on your alternator is faulty or going bad.

Is 16 volts too high?

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.

Can overcharging alternator kill battery?

Alternators that overcharge will typically produce excess voltage to the battery, making the battery case swell up, become very hot and lose its electrolyte through boiling. Improperly jump-starting the vehicle can send a surge through the battery that destroys one or more cells in the battery or shorts it out.