i'm putting a sat nav in my astra twintop. want to wire it to the switched live (so it comes on with the ignition), it any other car i'd wire it to the back of the stereo, but is this the easier way in the astra? are the cig lighters switched or constantly on?
how do i take the trim off to get to the wiring?
how do i take the stereo out? the sat nav is going on the vents in the middle, can i run the wire through the vent to behind the stereo?