So my 2000 xterra 3.3l v6 4x4 won't start. When I put my key in and turn it, your hear nothing, but it gets full power. The battery is good and fully charged, and the connectors are on tight. I also noticed that my security light is on at all. And it turns on whenever I open a door or pop my hood. Could my connectors or my battery wires be bad?