It isn't just the 98-00's that this happens to. It happened to my 03 and can happen to any vehicle on which the device that turns off the dome light when you close the door is INSIDE the door latch on the edge of the door. Sometimes the device sticks and the result is that the door ajar light is on, or the dome light is on, or both, even though both doors are shut tight. Spray WD40 or some other lubricant all over inside the door latch opening in the edge of the door. Then open and close the door a few times. If this doesn't work spray again and open and close the door a few times again. If it still doesn't work, its an easy and quick fix to take off the upholstery panel on the inside of the door and replace the sticking device.
Bright Red 2003 Edge Plus, 3.0 liter, reg. cab, 4WD, manual trans., 4.10 rear end.
Mods: Speedliner spray-on bed liner. Air box mod. K&N drop in air filter. Gibson Sweptside single pipe catback system. James Duff traction bars (above the springs type). Delta Industries black polyethelene truck box (mounted on the driver's side of the pickup box between wheel well and cab). Hidden Hitch receiver hitch. Side window visors. Door pockets.