There is an inline fuse behind the radio. You
may be able to reach it by removing your engine doghouse and reaching up under. Hope you're either VERY flexible... or a contortionist!
The alternative is pulling the radio out.
There are also a couple fuses under the hood in the right rear corner beside the radiator overflow container. I blew one of them when changing out my house batteries. Not sure if either pertain to the radio, but worth knowing about. They are simply hanging loose.
Under hood fuses:
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