I have just bought a sony cd/radio headunit (CDX GT200) and fitted it, already had the iso-plug block connectors so plugged straight in - fine. Only problem is it only works when the engine is OFF! Soon as i start the engine it turns off, stays off and when you turn the headunit back on after the engine is off it has reset all settings. The previous head unit did the same thing which was one of the reasons for replacing it! Please help, any suggestions/help appreciated! Cheers, Tom