Sounds like your are trying to wire a few different systems. The radio should have a fused power lead to it from the fuse block. Power for the directionals comes in the wires that go up the colum as does the horn button but the directionals and horn should be on different circuits out of the fuse block. I wouldn't recomend running unfused wires from the battery to ANYTHING in the car, good way to get a short and burn everything up! Each circuit should also have a separate ground. Sometimes it's best to sit down and draw out your circuits for accesories in the electrical system instead of just trying to plug and play different things. Check each circuit for power, shorts, and a good ground....