Question: What Should Alternator Voltage Be At Idle?

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 ..

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.

What is the sign of a bad alternator?

Symptoms Of A Bad Alternator The most common symptom is that the vehicle’s charging system will show an issue as the battery-shaped warning light comes on on your dashboard. If this light doesn’t come on, the “CHARGE” icon could also come on while you’re driving.

How do know if your alternator is bad?

Signs of a Bad Alternator Some of the things to look for are no-starting and trouble starting, dimming lights and problems with stereo system output. If your car starts but stalls when you’re underway, your battery is probably not being recharged due to a faulty alternator.

What RPM do alternators run at?

6000 RPMTypically, alternators have their full output rated at 6000 RPM but can continue to spin up to 12,000 RPM or more without any additional increase in output. The speed of an alternator is different for different type of car. The speed of an alternator depends on the speed of the engine.

How do I increase alternator output at idle?

Improving Alternator Output at Idle Speed If you only require a little more power at lower engine speeds you may be able to use a smaller pulley. The smaller pulley turns the alternator faster at lower speeds thus making more power. When using a smaller pulley care should be taken not to over rev the motor.

How many volts should a tractor alternator put out?

With the engine running at idle, the voltage at the battery or alternator output terminal(s) should be between 13.8 and 14.4V (using the DC test function on the multimeter). Turning on headlights (or spotlights) should not vary this reading too much. Below 13.7V your battery will charge slowly or, perhaps, not at all.

What voltage should my alternator be charging at?

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.

What are the symptoms 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.

How do I reduce the voltage of my alternator?

alter the field current – between the regulator and field winding by adding variable resistance. Will require some internal rewiring in the alternator most likely. 2. alter the sensing voltage level – between the battery and voltage regulator, by adding a voltage divider (diodes would work well giving 0.7v steps).

Why does my voltage drop at idle?

If the voltage goes down (compared to off) when the engine runs at idle, then the charging system is pulling the battery down somehow. If the voltagte is low with the engine off, then there is an additional load in the circuit between the meter and the battery, either in the voltage feed or the ground path.

Do alternators work at idle?

The alternator works at idle but at a bare minimum. It needs more rpm than is provided at idle to provide enough current for charging the system. That is why in a jump starting situation the donor car must increase the idle to supply the recipient with the “jump”.

Does alternator work in park?

Your alternator will charge your car battery if your engine is running, and your alternator is operating fine. … That means that your alternator should be charging your car battery at the same voltage regardless of if you are driving the car or if you currently have the car in park with the engine idling.

What causes an alternator to put out low voltage?

Charging problems can be caused by electrical faults in the alternator or voltage regulator, poor wiring connections at the battery or alternator, or a slipping or broken drive belt. Since most late-model import alternators are internally regulated, a failure of the regulator means the alternator must also be replaced.