96 lier wont keep a charge.

Ok I have tried 3 alternators and 3 different batteries and my car will not keep a charge. Even when I jump it off, it dies within 5 minutes or when I turn on the radio. Someone said it may be my termenal wires. Anyone have any ideas???
Thanx

Sounds like a bad ground wire, IMO

Which one? Or do i have to find out myself? Got the wire to the starter and 3 other look like ground. Think it's best just to chance them all? Heck it's cheap anyway.