1987 Ford F-150 ignition switch doen't start the truck.

Same thing has happened to my truck. Key will turn tumbler with out engaging starter. Battery seems ok.12 volts, and lights & accessories work ok. Fuses are ok. I have not replaced the switch yet. Saw a problem like this on page one from 11/30 where you reccomended replace the switch in the column. Guess I'll try that?

Try arcing across the terminals on the starter relay under the hood. This is a small black block with 2 or 3 terminals sticking out of it, located on the firewall to one side of the motor. If when you arc across them, the starter spins and starts the motor, this tells you that you ignition switch is no good. If it does not start the truck, look to see if one of the wires to the starter solenoid is broken, corroded, or if it may have rubbed and arced out to ground. If so, replace the wire.

Sorry for the delay. Thanks to both of you for the reponses.. The battery light does not come on in the instrument cluster when the key is turned in the tumbler. When this problem first happended, the battery light would come on, but no longer. Only the "overdrive off" light comes on. Anyway, I arked a screwdriver accrtoss the leads as suggested above and the strarter did crank. I tried it a second time and nothing happened. Did I fry the solinoid? Do I need to replace the switch in the column? This is a 1990 model F-150, six cylinder, 2WD. Thanks.

Well, after replacing the ignition switch, the key tumbler still would not engage the starter. Then, after removing the steering wheel and shroud and turn signal, etc, found that the ignition actuator arm was broken. This is cheap metal part that goes from the tumbler to the ignition rod, and moves the rod up and down along the steering column. I bought a replacement part at the local parts store that looks like its made of pot metal. Anyway, I got it all back together and the tumbler turns as its supposed to, and the ignition works again, and the truck starts in the correct manner. I dont use the truck very ofter so maybe the part will last a while. Thanks.