I’m turning my Expy into a camper/shell (removing ignition, battery, engine, etc.). Since I’ll be using my 12V power supply to power my radio, sunroof, windows, door locks, etc., how do I best tweak (e.g. jumper, splice, etc.) the circuitry/relay box(es) to “think” my key is “on” all the time? Hoping it’s just a matter of tying a pair of wires together somewhere.