1. that is teh best way to do it and no you should have no noise.

2. behind the seat is good try to keep it away from your power.

3.yes must always fuse poweer wires and it should be 6-10 inches 18 is just to far leavs to much room for fire.


i do this for a living and i see that alot of ppl know what they are talking about so you are in good hands here.