## What should my alternator be reading?

The voltage should read a minimum of 13 volts. A good alternator should put out between **13.5-14.5 volts.

What is the normal charge rate of a standard 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.

### What should an alternator charge at idle?

Most alternators that are charging properly should produce a voltage of about 13.8 to 14.2 volts at idle with the lights and accessories off.

What is normal alternator output?

Normal Output An alternator should put out between 13.5 and 15 volts of power. The alternator should be tested with the engine idling and electrical accessories, such as the radio and headlights, turned off.

#### At what RPM does an alternator start charging?

The minimum RPM is highly dependent on the specification of alternator. But a basic alternator will produce charging current anything above 2000 rpm. We can safely say, an economy car will idle around 750 rpm, a sports car around 1250 rpm and a race car around 2000 rpm.

What will cause an alternator to overcharge?

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. This surge disrupts the wiring in the alternator, causing an overcharging condition.

## What keeps an alternator from overcharging?

When the battery begins to overcharge, or more correctly reaches the designed voltage, the regulator lessens the field strength preventing the battery from overcharging.

What should the AC reading be on a Toyota alternator?

Turn the lights and fan on to load the charging system, and take your measurement. You should see less than 0.5, or 500mV AC. A higher reading means that your alternator isn’t properly turning the AC voltage it produces into DC voltage your system can use. Also, you live in Oregon correct? Is it dry where you live?

### How many volts does it take to charge a Toyota battery?

For example, at 70° F, the voltage regulator charges the battery at approximately 14.2 volts. As underhood or ambient temperatures increase, the charging voltage is reduced to about 13.8 volts or less to prevent boiling the water from the battery electrolyte.

What should the voltage drop be on a Toyota Charger?

Voltage drop in all of the above parallel connections ­shouldn’t exceed ­Toyota’s specified 0

#### Is it normal for an alternator to not charge?

Still, it’s perfectly normal for others to see the alternator not charge at all intermittently. One test is not enough if you are diagnosing a charging system problem. All too often, the alternator is condemned as the source of the problem if only battery voltage is present with the engine running.