I have a 95 F150 that is steadily giving that bing noise saying that a door is open the whole time i'm driving it. I'm not sure if the door light is staying on or not because it has no bulb in it. I've looked online and found that several people said to just spray wd-40 into the latch area but i tried that yesterday and it didn't help. Any Advise would be greatly appreciated...

 

On a '95 the switch for the dinger and the light(if you had one) is on the solid part of the cab by the bottom door hinge. I bet that little plunger for the switch is shorter than it should be or something on that order. Investigate there.