1. Incorrect installation: Ensure the ignition switch has been installed correctly. Double-check the wiring connections and make sure they are secure.
2. Faulty ignition switch: There could be an issue with the new ignition switch itself. Try installing a different switch to see if that resolves the problem.
3. Faulty relay: The ignition switch relay may be malfunctioning. Locate the relay and check for any damage or corrosion. Replace the relay if necessary.
4. Electrical issue: There might be an underlying electrical problem causing the ignition switch to malfunction. Inspect the wiring harness and look for any loose connections, shorts, or frayed wires.
5. Steering column issues: Ensure the steering column is functioning correctly. Check for any binding or resistance when turning the key. Lubricate the steering column if necessary.
6. Faulty starter: Although you mentioned you can jump the solenoid to run, check the starter motor itself. A faulty starter could prevent the ignition switch from functioning properly.
7. Fuse or circuit breaker: Check the fuses and circuit breakers related to the ignition system. A blown fuse or tripped circuit breaker can interrupt the power supply to the ignition switch.
8. Security system: If your F-150 has an anti-theft or security system, verify that it is not causing the ignition issues. Reset or disable the security system if necessary.
Remember to disconnect the battery's negative terminal before performing any electrical work on the vehicle to avoid electrical shocks. If you are uncomfortable troubleshooting electrical issues, it's advisable to seek assistance from a qualified mechanic or auto electrician.
