Having interior electical problems

After installing new stereo, all interior power gone. No interior lights, windows, door locks, seats, stereo, back hatch lock or air/ac. The truck starts and drives normal. Instrument panel/gauges work but the lights don't. We have checked the battery cables, Battery is only 8 mo.old and has power, and checked fuses. Can someone please help? Thank you, Deana
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Comments
Thanks for the report.
?????
I had a lousy '74 Volvo that was always breaking the plastic bellows that made the fuel injection system work. I had the factory manual and Volvo called it a rubber bellows (but if it had been rubber, it never would have cracked).
So I'd always go to the parts department and ask for a rubber bellows and they'd always say "you mean plastic bellows". Then I'd pull out my manual and get to enjoy my rant about technical "writers".