If your 93 Bonneville started last night and it fired right up but as soon as you turned on the lights the car died and will not start now what could this be?

When you say "it would not start", do you mean it will not crank(nothing happens when the key is turned)? or it will not start?( engine cranks but doesn't fire?) You need a new battery. I had the same problem with my 1989 Bonneville, It would start ou good but as soon as I pressed on the brakes, the car would turn off.