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I have a 2006 trailblazer LS V6. I let my brother use it and he accidentally jumpstarted it by the fuse cables that stick out of the fuse box on the driver side engine bay. After that nothing in the truck turned on besides the gauges and the engine, but the truck was drivable. But ac, window, power seats, radio ….nothing turned on. We change the megafuse and everything turned back on but and everything worked but now I have no crank and when I take the key off the red battery symbols stays on and the radio stays on as well, now when I switch back to the old burned out megafuse 125 amp or just remove it in general the truck cranks and turns on like normally but only the gauges and the engine turn on and the truck is drivable. Any suggestions?