Quick Answer: What Causes Overcharging?

How do you know if your 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..

Is 14.7 volts too high?

Charging voltages over 14.7 volts can prematurely dry the battery by boiling out electrolyte, and increase risk of a battery hydrogen gas explosion. … 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.

Can an alternator put out too much voltage?

Alternators are designed to put out too much voltage. That’s why a thing called a regulator is needed. The regulator adjusts a voltage to the field winding of the alternator and this sets the output voltage. If you got too much output your regulator has failed.

Can I drive with an overcharging alternator?

Running a car with an alternator that provides poor charge will damage the electrical ignition components of the car (even on older, pre 20000 vehicles) over time. … Overcharging is less common, but this condition does considerably more damage to the car’s battery and the electrical system if you ignore it.

Is overcharging still a thing?

It’s complicated, as leaving your battery plugged in all night certainly isn’t dangerous but it might make your battery age slightly faster. “Overcharging” is the term that gets thrown around a lot with this one. … This did, in fact, cause damage to the battery and reduce performance. Hell, it even led some to explode.

What causes an alternator to overcharge?

An overcharging automotive alternator can be the fault of the voltage regulator, an accidental electrical path causing the field windings to be powered independently of the regulator (bypassed) or the sense circuit to the regulator not properly providing the correct battery voltage to the 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.

Can a stator cause overcharging?

(Typically, a bad stator won’t put out excess electricity. One of the windings goes bad and voltage output drops.) This AC voltage goes to the regulator/rectifier where it is changed to DC voltage and the required amount is sent to the battery.

What are the signs of a failing 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.

What are the signs of a bad voltage regulator?

Symptoms of a Bad Voltage RegulatorDimming or Pulsing Lights. A damaged or failed voltage regulator can rapidly diminish the alternator’s ability to cycle power from the battery.Dead Battery. … Unpredictable Engine Performance.

Can I leave a trickle charger on all the time?

A: Generally, a car’s battery discharges 20 hours after a full charge. It can take longer if you have a larger battery. You should hook up the trickle charger 10 to 15 hours after a full charge. However, if you plan to leave your car idle for weeks or months unsupervised, you can leave the trickle charger on.

Does charging your phone overnight ruin the battery?

But then you heard that charging your phone overnight damages the battery and eats away at its capacity over time, so you turn to Google for answers. … Yes, you can leave your phone plugged in overnight.

Can a bad battery cause overcharging?

Bad Cell Lowers Charging Voltage Because normal charging voltage can’t be achieved on a battery with a bad cell, the alternator will overcharge the remaining cells and boil the electrolyte.

How do you know if your battery is overcharged?

Check for a faulty regulator if you find that the voltage regulator works like an electrical current that runs volts through the battery. If the voltage regulator goes bad, it can overcharge your car battery. Measure the voltage from the alternator. Again, the voltage should show a measurement between 12.8V and 14.7V.

Is an overcharging alternator bad?

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 …

Can overcharging alternator kill battery?

Over charging the battery will kill it just like not charging it. If the voltage regulator is shot in your alternator you could end up replacing the alternator and battery. It boils the acid on the battery and can ruin the battery .

How do you stop a battery from overcharging?

Simply connect between your manufacturer provided charger and phone. Charge-Check will detect when your phone battery is close to being fully charged and then, acting like a fuse, it will stop further charging. Battery overcharge protection couldn’t be easier! HEALTHIER CHARGING.

What happens if battery is overcharged?

Overcharging a battery causes excessive gassing — the electrolyte gets hot and both hydrogen and oxygen gas are generated. On older vented batteries, the electrolyte could cook away, leaving the plates exposed and ruining them. On sealed batteries, the buildup of gases could cause the battery to burst.