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View Full Version : How to do a concentric twist wire harness? (Milspec/Racespec)

Imarvin240
08-24-2017, 06:28 PM
I have been looking into building my own wire harness, but have come up with limited "how to" on building a true milspec harness. I'm sure I'm not the only one, so I hope starting this thread could lead to helpful info for everyone. And books/videos/websites would be greatly beneficial to all. Also, if a similar thread exists, I apologize since I couldn't find it. Thank you everyone.

This is the most helpful piece of information I have found so far, but it doesn't quite tell you exactly what you do/don't need and exactly how to actually exicute certain parts of the harness. Also, interested in what tools are actually needed.
https://www.rbracing-rsr.com/wiring_ecu.html

Hoping people on here have even more helpful info!
BoredEE
08-24-2017, 09:15 PM
Look up J-STD-001 I can't recall if wiring harnesses are covered in that spec but it should cover general soldering techniques at the minimum.

Just a warning D38999 connectors can get quite expensive.
Imarvin240
08-24-2017, 10:25 PM
Look up J-STD-001 I can't recall if wiring harnesses are covered in that spec but it should cover general soldering techniques at the minimum.

Just a warning D38999 connectors can get quite expensive.

Ill look into that, thanks man. I have read so far that when doing a milspec/Racespec harness, no solder should be used because it creates a weak point. Crimping is the preferred connection in this type of harness.