I recently installed my alpine headunit with bluetooth adapter which works brilliantly. The only problem is that when i switch my engine off the headunit and bluetooth adapter don't switch off. This is a bit of a pain as i have to remove power cables from the bluetooth adapter so it doesnt drain the battery.

So i managed to get a rear heater screen switch from a local scrap dealers and was wondering if it would be possible to wire up my headunit and bluetooth adapter to this so that it would act as a sort of 'kill switch' so all i have to do is push the switch to turn it on/off.

also if you can tell me what each of the wires is for on the rear heater screen switch that would be great :)

Could do that, could also find an ignition live wire, and connect it to the red wire on the iso/headunit lead, should switch off on the key then!

and where do i find an ignition live wire?