1998 K3500 Ignition question

Have a 1998 K3500 that the key ACC postilion does not work, no radio, or window operation. Also, when in cruise, I do not see any indication on
the instrument panel that cruise is activated.
I want to replace the switch, but wonder if I have other problems too.
The 'orange' light for the automatic is always on, except if in ACC, then it goes off.
Anybody out there have a 98 to compare notes with?
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