Hello, I have a 03 mc ss 3.8 it died at a light and now it won't crank I noticed i have no check engine light with key on and when i go to crank all lights in dash go out like dead battery but batt is good I think its the ignition switch but just dont know please help thanks,:banghead: Lar

Disconnect the battery terminals negative first then positive. They often have corrosion behind them that will cause your problem