Need Major help and bad, no electricity.

[Inlinesix]

i was driving my 1986 3.0 nonturbo supra. was running great. got home, put it in park and turned off the head lights. turned the key once, fron on to acc. and the whole car just died. completly. battery has a 12v charge. but it ain't making to the inside. dash lights, cigar, door lights, key lights for the door and the ignition, nothing. its all dead. checked the fuses and they all seem good. not burt. what do i do, i nned help bad.i'm out of ideas. please help.