Re: Disperate for help!!!! 86 F-150
I had kind of a similar problem with my dakota It would just quit running and for no apparent reason. Then one day it did not start again. I changed the coil, plugs, wires even the computer and nothing. I got a haneys book for the truck and went through the wireing diagrams. I rewired almost all of the truck. Every thing worked the fuel the starter every thing but it would not get a spark. As I was rewireing one of the last few wires I noticed that it was pretty bad off it was green and broken. One wire came from the ignition and was conected to 4 other wires (from the factory) it powered the coil the computer and a couple of sensors. As soon as I changed the wires it drove fine and never had another problem with it.
I would get a book on the wireing of the truck and trace down the wires and see if there are any loose conection broken wires or coroded conections. If the lights and the horn are causing the problem I would start there. Is it a stock horn? My dad had an air horn on his truck it was cool but every time he hit the horn it would blow a couple of fuses.