Ok
I installed a Head unit thingie in SWMBOs car back in April and since then the battery is going flat in a couple of days of non use, I used Iso Connectors to connect the stereo to the cars wiring, so i am not sure why it would be doing this.
Whilst i don't have a clue about Cars or Stereos i have previously replaced a head unit using ISO connectors with no problems.
What can i do to test whats is causing this, or should I just give up and take it to an installer?