The Battery is charged, but there is no electric response to any system on 1991 Toyota Supra

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the battery has ample charge, but there is no lights on the dash, headlights, the engine will not turn over. It is dead with a charged batter. Where is the problem?
(1) Answer
You have an electrical system failure. You need to trace power from the battery to the fuse box and make sure that you have power from the battery to the fuse box. Then go from there.

here is some info

Here is a link to the repair info for your car, that should help.