Ignition Switch Changeout

There are several places a problem like this could be, and you should try and chase it down before tearing the column apart.........that is what voltmeters are for

If you don't have one, run over to MyMopar and download a free factory service manual.

ABodyJoe on here has an old thread with photos that show tearing the wheel etc off and changing the switch.

In no particular order........

Could be ignition switch
Or switch connector exiting the steering colum
Poor connections in the bulkhead connector
Or right at the ballast
Or right at the ECU box or possibly even the distributor pickup.