What I'm trying to do is make it so my radio doesn't shut off when I turn the truck off.
When I had my Camaro, I could turn the car off, and take the key out the ignition and the radio would stay on till I opened the door. This is what I'd like. But I know Chrysler doesnt have many, if any, accessories that stay on till a door is opened.

What's my next best option?

 

I guess you could use a latching relay to hold the power "on" until the cabin lights come "on" (door opens) to drop the latch.

The New Dart has this feature.