Clarke, does the radio work at all with the ignition off? I think that is what Steve was suggesting. If it doesn't turn on at all until the ignition is on, it is definitely tied to the chassis batteries. It could be tied to the chassis batteries but not through the ignition even it does turn on without the ignition on. Steve's suggestion to move it to the house batteries is a good one. That might help locate the issue you are having.
Stay warm. It is 65 in Austin at 5:10 AM.
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