2003 ford f-250 will not start
got nothing when turning key. kept jiggling key back and forth and truck started for a second, than shut off. left key in accessory position and lights and accessories flitted on and off, grinding noise inside steering column. replaced ignition switch and truck started right up a for a couple seconds and then cut out. after doing this 4-5 times it started, almost cut out ,then surged back. hit the accelerated pedal and revved it up. truck stayed on and idled perfectly. started and stopped it a dozen times and ran it up and down the road. parked it and two days later tried to start it and same thing - nothing. can't figure out why it started when I installed new switch and cylinder then went back to same problem. new battery , cleaned battery cables and connections to starter.
Try putting vehicle in neutral and starting it and see what happens. I am thinking it may be your neutral safety switch.
good idea, but, unfortunately, it will not start in neutral either, does the same thing
You said you replaced the ignition switch now did you replace the whole ignition switch were the wires connect to it or just were the key goes into ? I am thinking you are going to have to remove steering column cover were you heard that grinding noise.
Good thinking, I would try to verify if I lost voltage to the switch, or from the switch. The trouble with intermittent electrical issues can be access to all the places power goes, connects and continues, the connectors, the controls in the circuit. after 10 years, you have to consider the vehicles usage, does it take a pounding, run hard tires, had power distribution box work done, or issues in that power supply center? are the firewall connectors getting a jarring or pounding, or the fuse panel? some connectors are subject to loose fit after 10 years, the wiggle test we started using in the 70's 80's and after can speed up the process. Or a test light or voltmeter connected where it should have power but doesn't, then rap on things with a screwdriver handle, we affectionately called that the hammer test. Every Ford tech as 3 main tools the BFH , The mFH, and The screwdriver. Then it gets technical.
Ground circuits can be verified from the battery, the body,the engine, and the frame, and each to the other, no continuity readings exceeding .5ohm are left that way, clean, tighten, or replace to establish good ground.
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