What is the output of a 12v alternator?

A fully charged battery should read over 12.6 volts. The actual output voltage produced by the alternator will typically be about 1-1/2 to 2 volts higher than battery voltage. At idle, most charging systems will produce 13.8 to 14.3 volts with no lights or accessories on.

How does a permanent magnet alternator work?

A permanent magnet alternator (also called PMA, permanent magnet generator, PMG or magneto) relies on the magnetic field generated by a permanent magnet to convert mechanical energy into electrical power. It can generate AC current, with which it can power the whole engine and charge the battery.

What is the alternator output terminal connected to?

B terminal – Main alternator output terminal (connected to the battery) F terminal – Full-field bypass for regulator.

Where is the alternator output terminal?

Face the rear of the alternator toward you, and find the threaded stud and nut on the back of the alternator near the top—the location of the output (battery positive) terminal. The battery positive lead connects to this terminal via a ring terminal connector, with the nut holding it in place.

How can I tell if my alternator is draining my battery?

To do a quick alternator drain power check using your digital multimeter, go to the section Bad Alternator Diode Test below. Then, if your alternator passes the test, do a battery check using a hydrometer tool as described in the Car Battery Hydrometer Test section.

What is a permanent magnetic alternator?

A permanent magnet alternator is a type of electrical generator that uses permanent magnets instead of coils to power and produce pulses of alternating current. A PMA provides electricity at a much lower cost with clear-cut power efficiencies.

Can you control the output of a permanent magnet alternator?

With permanent magnet alternators you cannot control the alternator output as it doesn’t have a voltage regulator or the electromagnet wire wound core to control it. Control of permanent magnet alternators is commonly done by varying the speed of the alternator.

What are the benefits of a permanent magnet generator?

Unlike traditional AC alternator systems, a Permanent Magnet Generator allows considerable benefits. Physical benefits with reductions in weight and length, coupled with electronic benefits, ensure a superior technology devised to maximise efficiency of the complete power system.

How does a voltage regulator work on an alternator?

The use of the voltage regulator controls the voltage sent to the electromagnet rotor core. With permanent magnet alternators you cannot control the alternator output as it doesn’t have a voltage regulator or the electromagnet wire wound core to control it.

Can a car alternator be turned on and off?

Unlike an basic car alternator which is uses a field coils which is energized by electricity and is turned on and off in a charging system to regulate the voltage a permanent magnet operated alternator does not have the ability to turn on and off. This has it’s advantages and disadvantages depending on the application.