Can't figure out an electrical draw?

OK I'd be screamin and yellin to whoever I bought the stereo from, just for the record, what is it?

Check with your meter--just how much current does it draw? Do any lights --indicators, panel lights, etc, come on with the yellow wire? Any chance the destructions are a misprint?

They are both Pioneer super tuner, I'm starting to think there is another problem it's not the stereo's. since both draw down the battery.
If I pull the yellow wire there are no draws. I know there will be a little from the yellow, it's supposed to have a small draw. Going to a mechanic friend to have him put a meter on it to see how much draw. Regardless it kill's a brand new battery in two days.