Fuse Found
With help from schematic drawings that Thor emailed to me, I was able to determine that the radio is fed directly from the battery, yellow wire with a 15A inline fuse. I searched around and found a yellow wire with an inline fuse attached to the battery isolation manager (BIM), under the hood. The 15A fuse was bad so I replaced it and the radio has power again. The attached picture shows the BIM with the yellow wire and inline fuse.
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