This is a 1992 F150
Where is the switch??
There is a warning light on the dash and the truck will not start.
Thanx in advance

 

I'm not 100% sure for your year, but you can try looking behind the passenger side floor panel. This is located under the glove box (near the floor, by your feet) that is where mine is located, but I also have a 2000.
Good luck