Alternator question

My volt meter is not working now ggggggrrrr anyway I took both field wires off and put a test light to check each one. With key off I have power at the positive stud and nothing at either field wire terminals. With key on I still have power at the positive stud and nothing at each field terminal.
AL
The guy who checked it was getting all kinds of juice out of it....I am stumped LOL
When they check them do they check the field terminals?