I've done it. Simply:I used a feed from my auxiliary battery.
- Access the two plugs that go into the back of the window switches on your dash. For each plug:
- Identify which of those wires going into the plug is the +12v feed from the ignition.
- Snip it about 4-6cm from the plug.
- Find an always on +12v feed (via a fuse of course) and solder that into the wire from plug.

