# How Many Amps Does an Alternator Put Out?

Alternator ratings range from about 60 or 70 amps up to 150 amps or more on many late-model vehicles . Some high-output alternators can generate upward of 200 amps. The amp rating of the alternator is matched to the vehicle's electrical system.
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In this article, we will discuss the amount of amps an alternator can put out. Many people do not realize the importance of alternators in vehicles. Alternators are responsible for charging the battery and powering the electrical system of the vehicle while the engine is running.

One YouTuber, Mr. Electron, has modified his tachometer to be rechargeable instead of relying on two AAA batteries. The laser pointer in the tachometer drains the batteries quickly, but Mr. Electron solved this problem by using two 2000mAh lithium-ion batteries.

However, the main focus of his video is on a motor alternator set he has constructed. He shows the backside of the car alternator, and points out the small and thin red and blue wires that are used to excite the rotor winding of the car alternator with a 12-volt battery. He also shows a custom-made three-phase rectifier that he created after the original rectifier broke.

Mr. Electron then demonstrates how he connects the 12-volt UPS battery and jumper cables to the rotor winding terminals of the alternator. He explains that full output of the car alternator will appear on the two terminals, red and black.

While Mr. Electron does not give an exact number of amps that the alternator is putting out in his video, it is important to note that the amount of amps an alternator can put out varies depending on the make and model of the vehicle. However, it is generally accepted that most alternators can produce between 50 to 120 amps.

In conclusion, alternators are essential components in vehicles as they are responsible for powering the electrical system and charging the battery while the engine is running. The amount of amps an alternator can put out varies depending on the make and model of the vehicle, but it is generally accepted that most alternators can produce between 50 to 120 amps.

## FAQ

How many amps does a 12 volt alternator produce?
The power that can be produced by an alternator is determined by the alternator rating. The output of the alternator ranges from 40 Amp up to 120 Amp. For high-amp alternator, it can generate up to 300 Amp. Commercialized alternator is usually 12 V.
How many amps does an alternator put out at idle?
So if an alternator is rated at a maximum output of 85 amps, its normal operating temperature maximum output is likely closer to 65 amps. Then at idle, its probably much lowerâ€”perhaps only 30 amps.
How many amps should my alternator be?
Most factory alternators are rated at 65 to 100 amps and are capable of handling your vehicle's basic necessities, such as headlights, gauges, fuel pumps, A/C, etc. These alternators also typically come with a 10 to 15 percent reserve to handle additional accessories.
How many amps is a factory alternator?
High output alternators (often found on larger vehicles) can use between 200 to 350 amps. Smaller cars by comparison, such as a Ford Mustang, will only use about 100 amps with batteries that run at about 12 volts. Determine the fuse ratings of your car's electrical components.
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