I was thinking about my ground and my car (tiburon) isn't that great for grounding. I really think it's just my car. Im not sure. But I was thinking about running a 4g wire from the battery to the trunk and ground it that way.

Is that a good Idea? Right now I have a 0g wire from the battery running to the back for power. Would a 4g wire for ground be to little? Would I have to match it with a 0g wire? Or should I just make sure the battery is grounded good then get a nice secure area in the trunk to ground?