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Is door ajar light on also?
One thing that will cause this is when a door-ajar warning goes without fixing.My Windstar rear hatch showed as ajar for quite some time - after a period, this caused the interior lights to be disabled.Flooding the hatch latch mechanisms with spray lubricant, i.e., WD-40, cleared the false ajar warning, and the interior lights automatically starting working again.See "Related Questions" below for more
I'm not a mechanic / technician but on a 1997 Ford Explorer I believe that if the gauge panel dimmer switch ( to the right of your headlight switch ) is rotated all the way up it will turn on all the interior courtesy lights when the doors are closed Also , is the " DOOR AJAR " warning light on in your dash to the left of the fuel gauge , if so either a door or the liftgate is slightly ajar or a door ajar switch is sticking , I believe that will also keep the interior lights on
If the lights that won't go off are the interior lights, then it could be a symptom of a stuck 'door ajar' switch/sensor. In that case, see "Related Questions" below for more discussion, fixes, and permanent repairs on the door ajar problem.
Just to the right of your headlight switch is a dimmer wheel for your gauge lighting If the dimmer wheel has been rotated all the way up , your interior courtesy lights will stay on ( even with your doors closed ) If your interior lights are on with a door ajar indicator light on in your gauge cluster , either a door ,your liftgate , or your liftgate glass is not closed or you have a sticking door ajar switch (Helpfull)
Check the plunger switch in the door. Sounds like it is shorted closed.
make sure ALL the doors are closed
why does my door ajar alarm keep coming on and off while driving my car.
Yes, if your car sits a few days at a time and your cars interior lights periodically come on it will drain your battery.
Check if the fuse for your interior lights isn't blown. On many cars the Door Ajar light will come on when there's no power to the interior lights. The dashlight then grounds itself through the interior lights. It depends on the car made. for example Taurus, just lubricate(real good) the lock with wd40, will take care of the problem. some cars have sensors will lock automatically when you close door then will LOCK automatically. if one of the locks is jamed the ajar warning come on. Easiest way lubricate all doors lock you will fine. Good luck
Check your guage light dimmer wheel ( just to the right of your headlight switch ) to see if it has been rotated all the way up - that turns on your interior lights. Also , if you are getting a door ajar warning light in your gauge cluster you could have a door ajar switch sticking inside one of your doors , liftgate , or for the liftgate glass
To the right of your headlight switch is a dimmer switch for your gauge cluster lighting - I'm not sure if it's the same on your F150 as my Explorer but when my dimmer switch is rotated all the way up it turns on my interior lights . Also if you have a door ajar light lit up in your gauge cluster , you probably have a sticking door ajar switch