My vehicle is a 1992 Toyota Previa. I have absolutly no power, no lights ect. Dead. Battery has been replaced and alternator was replaced about a year ago.

Before you tear anything apart check your battery cables on both ends for looseness. Dirt or corrosion.will not let power through. I tried to boost my car and nothing would work. It was like the battery was dead so I got towed in. They put a battery tester on and the battery was fully charged so they replaced my battery cables and bingo everything was working again. One cable was not letting the power through it.