Flip your boot lid up, pull off the positive battery lead and then replace within 5 seconds, pull it back off again then replace within 5 seconds, repeat for as long as necessary....
Flip your boot lid up, pull off the positive battery lead and then replace within 5 seconds, pull it back off again then replace within 5 seconds, repeat for as long as necessary....
You can buy flashing LED's. You need a simple resistor to limit the current (or better a proper circuit, you can google how to do this with a couple of transistors.) Not sure how you'd get a live feed when everything else is off. May be spend a couple of hundred quid and get an alarm fitted?