[RoboCoach]

For some of the power wiring, what we did was take the black and red wires, chuck them into a drill and twist them together (not too tightly as to compromise the insulation). This makes for a neat cable that can be traced across the chassis without much of a problem.
Taking this one step further you could twist onto the red/blk bundle a third 'tracer' wire of a different color (and maybe lighter gauge) to identify that particular pair.