Hello all new here, Mine is a strange problem,after years of working on all type of cars and trucks I finaly ran into a stumper. A 1997 F-150 w/a4.2 A/T the truck tries to start by itself key in or out of the ignition, when it is running the starter kicks on and off intermitently of course grinding, for some reason the starter wire in receiving voltage after it is running. Starter switch is fine. Hopefully someone can steer me in the right direction. Thanks

 

If the ignition switch is fine, try swapping out the relay for the starter motor.

 

I didn't think there was a relay for the starter,were would it be located