Well, if the alternator is on any type of vehicle that has been made within the last 100 years, it will be the 100 amp alternator. There is no such thing as a 1900 amp alternator for a car. The highest I have seen is about 150 amps, and that is a heavy-duty truck alternator.
They are stamped from the factory. The numbers are on the unit but hard to see.
I don't know where to tell, but replacement alternators range from 100-140 amps for that model year.On the top & to the right of the alternator you will find some numbers look for 3 numbers followed by an A which stands for Amps such as 105 A. The numbers are usually hard to see, you can take a piece of white chalk & rub over them to get them to show up better.
Take your battery to Napa and have them test the cold cranking amps, they'll tell you whether or not you need a new battery
In most cases if it is an alternator then it has an internal regulator
How to Tell If Your Car Alternator Is Bad Check related link below…
WATTS = Volts x Amps For me to tell you what kind of amperage you're dealing with you'd have to tell me what voltage you're using. Or you could simply do the math yourself. Simply divide the watts by the volts and you'll get amps.
A quick way to tell if there might be a problem with an alternator is to remove the positive side battery cable from the battery while the vehicle is idling. If the engine dies, odds are there is an alternator problem.
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Any auto parts store where you will go to buy a new alternator can tell you what you need.
Seized should mean that it's not turning. Crank the engine and see if the alternator pulley spins or not.
Something to do with the alternator.
Your main breaker should tell you the amps of your panel.