Bit of a fun went to start my car yesterday and battery was flat. Charged the battery up and started it and wasn't charging so checked and the alternator exciter wire wasn't live so I lived it up and started charging. I went to turn it off and won't turn off so stalled it and re started it and it's charging now but won't turn off. So I removed the exciter wire off and then it turns off. Sounds like it's back feeding the ignition system but could this be Down to a faulty alternator ?