can someone please explain this a lil more in depth thanks and wats fig8 wire?

The RCA earth fuse inside your headunit could be gone. Get some wire, fig8 will do, and put it on the ring of your RCA outputs from your headunit, and ground them. Fire it up and see it that fixes it.

Figure 8 wire is just plain old twisted pair (cheap speaker wire)

oh ok, can i use any speaker cable? and can someone explain how u are ment to put it on the ring of your RCA outputs from your headunit