Ground cable is kind of hard to access as it's hidden somewhere in the wheel well.but to make sure it's ground issue( which looks like), take a jumper cable and use just one wire of the cable(either red or black).Let's say you use black.So connect one end of black to any metal surface on engine which is non painted.and connect other end to metal point on chassis like shiny bar just on the top of radiator fan.Leave both ends of red wire alone.and try to start the engine.
Let me know if you want more description.