I need to make a power switch that turns everything. I have one, and it has 3 pins on the bottom, i just need to know which pins go to what. I have seen a diagram where the positive battery wire goes to the left pin, the negative goes to the right pin and the middle one goes to the system, but how am i supposed to get the positive and negative by themselves. Because the positive and negative need to go to different places. How am i supposed to wire it?