[wireties]

There are a lot of great looking harnesses in this thread!

It is not magic - there are guidelines to produce a good wiring harness. My company makes racks of equipment used on airplanes and ships (where vibration is a huge concern). Without quoting all the relevant standards, here a a few quick helpful rules to (try to) follow:

- Of course be safe - follow the FIRST rules for wire size and color
- Always use the correct tool to crimp any terminal or pin
- Test each crimp physically (pull on it) and electrically (with a meter)
- Use wireties at every point that a wire or cable leaves or enters a bundle
- Use wireties at least every 6" along a bundle
- Secure the bundles to a guide or structural member
- Wire "orthogonally", run wire and cables straight in and out on X, Y and Z planes (no running wires diagonally across an open space)
- Wireties near an endpoint (connection) should leave a short loop or curve near the connection for strain relief - you want these wires to move some with vibration but not in a way that loosens the connection
- Wireties on the bundle should firmly secure the bundle to the structure - you do NOT want these to move
- Do not exceed the bend radius of any cable or wire
- Do not run wires through a hole (in metal) without protection like grommets or heat shrink or sleeves of some sort (so vibration does not wear the insulation and short the copper to the metal)
- Label every wire at both endpoints
- Document your wiring harness (FIRST already gives you a drawing of required wiring)
- Plan ahead so you have room and mount points for the wires and wireties
- Do much the same thing with your pneumatics

Good luck!