Pro tip: remove fuse #4 from the box behind the glove compartment to defeat the door switch and prevent interior lights from staying on. Be warned that this also defeats the chime that warns you when your headlights are left on and the door is opened. The interior lights have an automatic timed shutoff but the headlights do not.
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Enjoy your Jeep! Glad you're doing the right thing and getting it doorless!
...As said above, it's the door switch, pull the fuse or wire in a switch to turn off the dome light. Kits are available online to add the switch to turn off the dome light when you pull the doors.