Hi David and welcome to the madhouse that is EuroKClub!
No idea what a DAV is but congratulations, unless it is so e horribledisease of course.
If you remove the battery cover you will find, taped to the narrow crossmember at the front, a connector for a Sat Nav.
This has an earth as well as two switched live connections, one instant off with ignition and the other delayed by approx. 30 seconds.
If you search the Sat Nav board you will find links to the special cable with connector available from dealers or other outlets (at least here in UK). Simply plug it in and take your pick of the 12v feeds.
If you are connecting anything other than low current items like a sat nav, you will be best using the feed to power a relay.
Good luck. Brian