Greetings. Please explain cluster. You probably already know that the chassis radio (cab) gets its electrical source from the coach. There's a whole can of worms involved in the coach intermittent power, toggle switch by the coach door, the automatic steps, and power solenoid in the back coach battery compartment. If your steps and lights in the overhead cab compartment are working, then you need to check continuity where the new radio was installed. Check old forum chats for more info, or electrical diagram. Perhaps someone more techy will respond.
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