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Welcome to Just Answer I'm Chris aka Moose, I'm sorry you are having problems with your 2500 electrical. I will do my best to help you get this resolved. If I happen to be helping another or step away during our communication, please know I will follow up as soon as I am back available/online.
Unfortunately, that does not help. In your case, it may be best to tow the vehicle to a shop. For the radio concern, it being on is controlled from 2 things, the ignition switch, and BCM. Either could have failed and resulted in the battery draining, which in turn could have damaged the BCM and instrument cluster. When a draw on a battery kills the battery, the dying battery can cycle on and off rapidly and damage sensitive electronics. I do not recommend any repairs until proper diagnosing has been done.
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I'm going to go ahead and mark your question complete if more help is needed, all you need to do is reply.
We do not know what time zone customers are on nor where they are in the world. I work till 5 am in the morning and see just as many customers asking questions then as I do when I am online at noon. Sorry, it was a time when you are asleep when I responded.