Disappointed,

'Nuther story. My son-in-law had an older car. Kept killing the battery. What's wrong he asked? So I got in, started the car and the ammeter instantly showed discharge. Revved it up, went more negative. Dropped down to idle, less negative, but never, ever showed positive. So I asked, how long has this been doing this, pointing to the ammeter. Doing what? Guy had no idea what an ammeter was.