Car won't turn over or start. All I hear is rely switch click. Recently bought refurbished battery, but it shows 11 volts in car when I took it out it read 15? Some days I can jump my car off, some times that doesn't work, and some times tapping on starter works. Took the starter off to test it its good. Changed battery cables. The fuses did act weird though. One day half of them had power and the other half didn't. I changed fuses out and still no power. The next day I was the exact opposite and when I touched on fuse it made noises and flipped switches?