I am not sure what you mean by the courtesy light on the radio console?
Are you are referring to say an indicator on the radio showing it is working? I would expect that to be lit while the engine is running.
Otherwise, it sounds a bit like my coach. Whenever you open the door, the overhead light comes on, as well as the running lights on the coach'es exterior. They stay on for about a minute before going off.
All I can offer is a wiring schematic from ford for their cut-away chassis to allow customer (rv builder) connection of items to the chassis.
You can find those details at:
https://www.fleet.ford.com/truckbbas...bodybuild.html
Click on the link for your year, then on the next page that comes up, you will find a link to the electrical section.
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