Originally Posted by Adamalli

Poke around on there website. They have lots of different versions of this thing. How it works is by reading the hi and low canbus signals from the car and then it triggers an output of 12vdc, which could be used to run a relay. Not sure how familiar you are with canbus but it is one of the communication signal the vehicle uses to talk to all the onboard computers and sensors. A common example of what this could be used for is if you wanted additional highbeams mounted in your grill. This device would sense the signal of you turning the highbeams on, or them automatically turning on if you have that feature, and then send a 12v signal out the output wire which could be used to close a relay to turn on your additional lights. Basically it makes accessories work as if they are part of the factory wiring.

So in your case you would want to make sure you got one of the products that has the ignition signal sensing. You would then take the output wire for that and attach it to whatever needs that signal. I am guessing that would be your dc2dc charger.

Originally Posted by Adamalli

You could do the above with fuse tap. There is a fuse in the boot fuse box, I think it is the top left fuse, that is only on when the ignition is on. But you have to drill/file a hole to get the wire out. The canbus solutions much cleaner.