Overcharging

When testing for voltage at the Field wire by putting 1 probe on battery positive one on field connection is it still suppose to be attach to alternator? I read that it shouldn’t be more than .2 volts? Just trying to make sure I’m getting a valid reading by pulling wire and testing.

I tested across the amp meter and got the same reading at both terminals as the ignition connection

And yes it was showing positive charge at amp meter