How can I tell which is "Armature" and which is "Field" on my generator?

Hey, just swapping in a new generator in the truck and THIS one is un-labeled. Aside from dis***embling it, is there any way to tell the difference between the posts? Will damage result if it's hooked up incorrectly, or will my "charge" light just come on?
I had the generator tested a few months ago and it's good, I just don't recall which post is which.

(Pretty sure it's off a 60's GM truck though; it is 12 volt if that rings any bells)

Thanks!!!

 

Usually one or both are marked but the Armature post is gong to be connected to the brushes and the field post is going to be connected to the field coils.
This might help
http://www.google.com/search?source...tnG=Google+Search&aq=o&aqi=&aql=&oq=&gs_rfai=

 

I still don't see any marks...

What's the "bad news" if it's connected incorrect?

 

on a 53 chevy truck gennie, the field has a small "f" and is on the right when looking at the pulley from the front.

 

Anyone else?

 

Some gen sets had different sized posts which would ***ist you as the terminal connections on the wiring harness would match up accordingly. I can't remember if alternators would show up the same way.

 

The field terminal is generally has the smaller diameter post.