I'm going to replace my Mk I in my Citroen with the Mk II I'll (hopefully) receive tomorrow. The way it's wired now is that there's no permanent power feed to the Mk I, but rather a line that has 12V only in the "ignition" (or, in my car's case, its Diesel equivalent...:-) position. Now, does the Mk II have to have a permanent power feed, or can it work with the setup I have? What I'm afraid of is that it might be possible that it needs longer to store its state than the Mk I, so that when the power goes away it might not be able to save its state before the power is completely gone. Or, as it has a separate permanent 12V input, maybe the circuitry to store its state using the last few electrons from the fading power was removed from the Mk II...
So, do I have to have a permanent power feed?