headlight Wiring Short? bad Ground?

Hey there,

I have a 97 Cavalier that has what i think is a bad ground somwhere. When the lights are turned on you have one bright one and the other 3 are all on but dim no matter what;

If you high beam the bright switches on the one side but the other 3 lights are allways on and dim.

Any Ideas?

all 4 lights shouldn't be on at the same time. either the high & low beam wires are touching somewhere or the switch is bad.