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# Why does my battery gauge move up and down?

## Why does my battery gauge move up and down?

When the battery’s state of charge is low, the voltage is raised slightly to quickly put the charge back in. When the state of charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gauge, you may see the voltage move up or down. This is normal.

## What does it mean when your battery gauge goes up?

What this means is, its likely your alternator which has a built in voltage regulator and it is over charging your battery. You should have the alternator tested and most likely it will need replacement. The normal charging rate is 14.2 volts. This could ruin your battery if you let it go to long.

How can I tell if my alternator is in good shape?

Make sure the voltmeter reads at least 12.2 volts, then start your car and rev the engine to 2,000 RPM. Keep the engine running and check the voltmeter again. If the voltage is between 13 and 14.5 volts, your alternator is in good shape.

What should the voltage be on an alternator?

Check the reading on the voltmeter again. The voltage should increase by between 0.5 and 2 volts to around 13.6 to 15.8. If the reading stays the same or drops, that means the alternator isn’t charging and you may need a new one. If the reading is more than 2 volts higher, that could mean that your alternator is overcharging.

### What does the alt light on an alternator mean?

In most cases the light is shaped like a battery, though some show “ALT” or “GEN,” meaning alternator or generator, respectively. (In some older cars, the alternator is referred to as a generator, which may be helpful to know if you’re looking through the owner’s manual or a shop manual.)

### Do you need a multimeter to check your alternator?

A multimeter measures voltage as well as other electrical properties such as current and resistance. You want to measure voltage when you’re checking your alternator. Check the battery first. The battery is needed to start the vehicle, which, in turn spins the alternator at sufficient speed to keep the battery charged.

How does a tachometer work in an alternator driven car?

Alternator driven models func tion from pulses generated by the engine driven alternator that charges the battery. The alternator must have a terminal for the tachometer. Ignition models get their signal from the ignition system. This can be from the coil, or a tachometer output from the ignition.

What does an alternator do in a camper van?

Click Here In a Camper Van or Motorhome, you’ve already got a generator built-in. It’s called your alternator. The engine spins the alternator which charges your starting battery which powers all of the electrical devices that your vehicle needs on a day to day basis. Spark plugs, ECU, Fuel Pump, Air conditioner blower, radio, and much more.

#### What do you need to know about the alternator?

Understanding the Alternator • The regulator is the brain of the charging system. • It monitors both battery and stator voltages and depending on the measured voltages, the regulator will adjust the amount of rotor field current to control alternator output. • Regulators can be mounted both internal or external.

#### Where is the drive pulley on an alternator?

• Alternator drive pulleys either bolt on or are pressed on the rotor shaft. • Both ‘V’ and Multi-grove types are used. • Note this alternator does not have an external fan as part of the pulley assembly. • While many manufacturers do use a external fan for cooling. This alternator has two internal fans to draw air in for cooling. Drive Pulley

Ruth Doyle