The clock spring in the new one you installed is most likely the problem. It is the part behind the steering wheel that the airbag, horn, and cruise controls plug into. It is very common on Chrysler minivans. Unfortunately it sounds like you inherited the problem with the used unit.
They are not that hard to replace. You will need a steering wheel puller. Sometimes you can rent them from your local auto parts store.
Disconnect the battery and wait about 20 minutes.
Remove the air bag from the steering wheel.
Remove the center nut that holds the steering wheel to the shaft.
Unplug the horn and cruise connectors from the clock spring.
Use the steering wheel puller to remove the steering wheel.
Unplug the back connector to the clock spring.
Remove the snap ring that holds the clock spring to the shaft.
Remove the clock spring.
Since the one on the old column worked you can reuse that one if you choose. I would pull the one on the new column first so you know what to expect when you remove the old one from the old column.
This is what the part looks like
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