Some where you hooked a wire to battery power that is back feeding power to the ignition switch.
The most likely spots for this to happen are the starter motor, or if you have a fender mounted starter solenoid you may have put a wire on the wrong side of the solenoid.
How many thin wires do you have going to the starter?
Make sure it is the brown wire is going to the solenoid.
Also make sure you have it on the solenoid stud == Sometimes there are 2 small studs if you have the small wire on the wrong stud it could give you a backfeed to the switch cause the dash lights to light- no crank -start.
Usually the solenoid wire is the one closest to the engine block, but it would not hurt to clean it off and make sure.
Many times jeep has a push on connection to the solenoid, however the wire should be brown (clean them off so you can see what you are doing.
When there are 2 small studs one is marked S the other R make sure you are on the S with the BROWN wire.