Battery charge

I would like to know where the ground wires are located on my 1998 z24 cavalier, I cleaned the battery cables and replaced the rusted terminals, still my lights on the dash go haywire. I'm thinking I may need a new battery or check the ground wires. My battery box has rusted away, therefore my. The battery is shimmed down on whats left of the box. It starts with no problem, but stalls out when I drive. What do u think is happening