Altonators rated in amperes
You're going to need to work on your input procedure.
Let's break this down:
Altonators rated in amperes
The sentence would go like this:
"Alternators are rated in amperes."
With a period at the end to note the completion of that thought. That said, I don't think there's anybody here that doesn't know how alternators are rated.
you said current one was 50
Once again. The period matters. It's so that the rest of us know where that sentence ended and the next begins.
so a larger more current would be 75 or 100 amps
This one will really throw you for a loop. Not only is there a period but there is also a comma.
And 75 and 100 are both, greater than 50? That's amazing!
Now... Do I care if there's a grammar mistake from time to time? Oh, hello no. They are often funny. Thread posts though, should also have a reason to exist. Yours have provided zero useful information and are just lazy.
So, if you're going to come in here to converse with the rest of us "Rocket Scientists"

then you need to put [some] effort into the point you're trying to make and that point should be relevant. Otherwise... Bookface is thataway >>>>