Hey have the exact same problem with my 89 F 150. I have replaced the actuator arm, ignition Coil, and ignition switch along with everything else I could think of, I tried troubleshooting it by by passing wires from the brake switch to the transmission switch and I just cant find the problem. of course I can start it by bypassing the solenoid but eventually that is a hassle and I wanted to fix it for good. But it sounds like getting a whole different steering column is my option, any one have any remarks??