i have a vectra 2.5 v6 gsi and i take it on long journeys as soon as i switch off it wont start again and have to recode radio battery is fine and been tested
You still have a problem with connection with the battery. Try cleaning uo the points on the battery and make sure you have fixed the battery leads onto the battery tightly and if you still have the same problem then check for short circits, the problem is with the battery losing connection.
Kind Regards