Q: Suburban won't start with no interior lights at all

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My truck will not turn over or anything. No dashlights/radio/security telltale. I've tried about every fix I've found and haven't come up with anything. Before all this it would turn over but die within seconds and like an idiot I disconnected the bcm without disconnecting the battery and now I'm down to nothing happening. Did I fry my bcm?

My car has 174000 miles.
My car has an automatic transmission.

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