Found mysterious light bulb, help
I recently changed the rear diff fluid on my 1994 f-150 and happened to notice a light bulb under the truck bed. I remove the bulb, it was burned out so I replaced it. Then I tried to find a way to turn it on. Well there's the problem there is nothing in the manual about this light and going by its location it sees to me that its there to shine light for changing a tire. So I tried turning on the dome light, hazard lights, headlights, dropping the tailgate. nothing, HOW DO I TURN ON THIS DAMN LIGHT. and what exactly is its purpose? thanks.