Hello, A couple of months ago i had installed an amplifier sub and new head unit. The head unit needs to be turned off manually as it doesnt switrch off w the ignition, but i do this religously My problem is that i work offshore on an oil rig at 2 weeks at a time and the last two times i have came home from offshore my battery has been completely drained, and this morning after haven given the car a good run the day before the battery was flat again....all this has only started happening since the stereo equipment was installed. So....today i went to Halfords to get a new battery, and asked the guy to fit it as i needed to go do some shopping blah blah.....when i got back the guy said that he couldnt get access to remove the old battery and said that when he connected the old one back up that there was quite a spark and that he believes that something is drawing a current when the ignition is off. When i got home i investigatred a wee bit, the amplifier is deffinately turning off w the h/u..........I also disconnected the amp power cable from the battery then disconnected the battery terminal and connected again minus the amp power cable and there was still a spark....the only other new bit of equipment is the aerial amplifier for the headunit, could this be drawing a current when the ignition is off?? Was also thinking that is it really abnormal to have this spark when reconnecting the battery as there is also the alarm system drawing a current......any ideas will be appreciated.