How do I figure out how many amps a alt. is

[mustang2]

I've got one off my 77 302 and one from a 75 4 cyl. Just trying to figure out how you tell how many amps it is.

 

[Power Surge]

I've got one off my 77 302 and one from a 75 4 cyl. Just trying to figure out how you tell how many amps it is.

I would say with 99% certainty that it's a 60 amp. Ford's 70 and 90 amp units from those years were physically larger and don't bolt onto a small block or 4 banger.

 

[vetwhat]

I've got one off my 77 302 and one from a 75 4 cyl. Just trying to figure out how you tell how many amps it is.

look at the casing really good, the amperage should be stamped into the metal. most of the ones i've seen the stamping is weak so get it good and clean.

 

[Blue Thunder]

If I recall, the alt. on my II is stamped "55 amp".