Skip Benner Light Bar
The light bar is made by Skip Benner Racing, I'm not sure if it's still available, their homepage doesn't go anywhere.
The wires are covered in convoluted tubing and merge into one tube with 4 wires in it. The 4 wires go to a flat trailer connector as a quick disconnect. I was worried that the trailer connector would be a weak point in the system but it easily handles the power flowing through it and the lights are still at full power.