Why does your dome light not come on when the door is ajar the switch is in the correct position for the door?
The bulb could be blown.
Just to the right of your headlight switch on your dash , is a gauge lighting dimmer wheel switch . Check to see if that has been rotated all the way up. If it has , that turns on the courtesy lights when the doors are closed If you also get a door ajar warning light in your gauge cluster , you probably have a sticking door ajar switch . The door ajar switches are…
To the right of the headlight switch is a gauge light dimmer wheel , if that has been rotated all the way up , your courtesy lights will stay on with the doors closed. If you also have a door ajar light lit up in your gauge cluster , then you may have a sticking door ajar switch , or something isn't closed properly
On the 1984 the switch is located on a metal plate in the engine compartment side of the trunk--it is just a pin switch--probably the metal plate has bent down--or if you want just remove the wire on the switch A work around it to remove the ajar light bulb from the instrument panel. Make sure your trunk light or spare tire compartment light are out or you will drain the battery.
Try spraying WD-40 on the door latch, the part that is on the door itself. The door ajar switch is located in with the latch. Had the same problem, door ajar light on, interior light stays on, and horns toots twice when you lock with remote, to signal door is not closed. Door was shut but truck didn't know it, WD40 fixed it.
the door ajar switch is Incorporated into each door latch if you have a problem with the door ajar light staying on along with the interior and running board lights spray each latch including the back glass and door latches and open and close each door several times this should fix the problem good luck