Ignition relay or lock cylinder problem? on 1999 Ford F-350 Super Duty

How can I tell if my prob lies with the electrical relay or the actual lock cylinder?

Asked by for the 1999 Ford F-350 Super Duty
You need to split them apart and then test them. I have seen lots of problems on F-series trucks with tilt wheels The mechanism wears out and wreaks havoc with the operation of the Ignition Switch et al.
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