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Usually brake controllers will give you a bad connection at trailer reading only because there is no load, but it wouldn't hurt to dissconnect it at the small break
out box by the brake pedal.
It looks as though the only circuits that fuse powers is the PRNDL switch on the side of the trans(which may water instrusion casuing a short to ground) the
a/c compressor relay (which you can just remove) instrumnet panel cluster(which I know has been replaced but it doesn't mean it can't be faulty) and the turn signal switch. Luckily it doesn't run a lot of circuits so you can eliminate stuff one by one to try and locate the fault. I have seen replaced(mostly repaired by aftermarket company)clusters fault so it wouldn't be the first time. I'd be more inclined to look at the PRNDL switch for fault only because the fuse only blows when cranking.
Chris
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