Mine was doing the same thing. 39 years old, many cycles.
Occasionally the heater blower would not work unless key was moved slightly back in 'on' position.
Sometimes accidentally cut off the engine, quickly moving back to key 'on' to stay running.
Was concerned would arc a fire someday, more so do to wear than a defect.
https://www.autosafety.org/ford-ignition-switch-fires/
Did nothing about it for 10+ years.
Solution:
New Motorcraft ignition switch. not hard to do. Took less than an hour.
Last year, tested if the small bolt fasteners would loosen easily. No problem.
Tested the water. Was not in the mood to take the dip....
Finally replaced 8/17 after 6 years of unfounded procrastination. Carried switch in car toolbox.
Disconnected battery.
Marked position of old switch just in case. New one did not need any adjustment.
Turned key to off position. Checked new switch was also indexed to off position.
Both fasteners came out fine intact, no drilling, etc, as did the ele connector.
Of course, be careful with the wire harness connector tabs.
Replaced both metric fasteners.
Old switch was not split or anything visible in or out to indicate wear.
New switch has more robust feel when turning key to start.
Ignition lock cylinder:
Have replaced that too. They wear out. Failed suddenly 8/2001 in driveway getting ready to go to car show.
No start. Could not turn key. Had a feeling beforehand. Was getting sticky turning or something.
Had new cylinder from Pep Boys with me. Surprised took only 20 minutes. Made car show easily.
Wise to think ahead for easy removal. When it fails, no telling when or where that will happen.
Like if you have to 'scramble the bomber'.
Consider the fact a new cylinder will have a new key coded differently from the door.
Need to re-key to keep one key door/ignition.
Instructions online how too transfer old ignition tumblers the new cylinder to keep the old key.
A Ford dealer or locksmith can do it. Ask first.
Ford dealers also have the best key blanks.
Replaced the combo turn signal switch 1/17. AZ Duralast. Solid. Works great.
Good feeling knowing all is well in the column.
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