[shorod]

I agree with Selectron, the only issue I see is that ground designation for the distribution bar. Also, to avoid a fire you NEED to have a fuse of appropriate current rating between the distribution block and the battery. If you find that after removing the ground from the distribution block you are blowing the fuse, then substitute the fuse for a test light. As long as the short remains the test light will glow at full intensity when the battery is connected.

I have a question regarding the light you are controlling. If that is a set of fog or driving lights, the relay is a good idea. However if it is a set of LED lights or other low current lighting, you don't really need the relay assuming the switch and wiring to/from the switch can handle the small amount of current the light would draw. No point in over-complicating the circuit if you don't need to. I'll also assume the relay connection going to the lights is terminal 87 such that the light gets current when the switch provides power to the relay coil.

-Rod