In my coach, from plant 750; not plant 850 like your Challenger) there is a 5 amp inline fuse in the power wire to the radio behind the radio. I found when I pulled the radio to wire a 9" camera monitor. If you are lucky, you can see it by removing the instrument access panel on top of the dash.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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