113: A “Mil-Spec” Wiring Harness is Total Overkill for Most People.
About this episode
Eric from Hardwired Performance joins the podcast to discuss the intricacies of building professional motorsport wiring harnesses, often referred to as mil-spec. He shares his journey from a hot rod shop to specializing in high-quality wiring for off-road vehicles. The conversation covers the importance of proper materials, techniques like concentric twisting, and the use of Autosport connectors. Eric emphasizes the need for planning and documentation, as well as the balance between aesthetics and functionality in harness design. He also reflects on the evolution of his career and the automotive industry.
Looking to up your game with a super-informative masterclass on professional-level motorsport wiring? This episode of Tuned In featuring Erik Reinertsen of Hardwired Performance is exactly what you're after.
Use “HARDWIRED50” to get $50 OFF our HPA Motorsport Wiring Starter Package: https://hpcdmy.co/wiringstarterb
Erik specialises in building top-level motorsport wiring harnesses, choosing to focus primarily on the demanding offroad racing market — but wiring wasn’t always on the cards for this Californian. Despite growing up around hotrods and motorsport with a father who built cars for a living, he was actively discouraged in following his Dad’s footsteps, instead being pushed towards a more conventional career.
The problem was, you can’t really expect your kid to not become a diehard car guy when he spends all his time messing around in your shop full of cool builds and weekend after weekend at the track. So, straight after school, Erik walked into an apprenticeship at a hotrod shop and began building his skills in fabrication, engine building, and nearly everything else in the car building world — but it was wiring that he excelled at. Many years later, Erik is a self-taught maestro building ultra-high-end motorsport looms for some of the most impressive race cars and trucks out there.
In this episode, we dig deep into Erik’s huge bank of knowledge and experience, discussing a big range of wiring-related topics — from the art of concentric twisting, autosport connectors, which tools are worth the investment, the correct gauge of wire to use for different applications, and a whole lot more.
Erik also weighs in on the myth of “Milspec”, discusses the many cases in which a pro motorsport wiring harness is complete overkill, and the lessons learned from running his own wiring business — particularly when it comes to the challenge of accurately quoting work and turning down jobs that you know just aren’t right for you.
Vicious Mustang: https://www.instagram.com/viciousstang
Follow Erik here:
IG: @hardwiredperformance
Don’t forget, you can use “HARDWIRED50” to get $50 OFF our HPA Motorsport Wiring Starter Package: https://hpcdmy.co/wiringstarterb
Time Stamps:
4:06 How did you get interested in cars?
13:50 How did you get into motorsport wiring harnesses?
19:57 Why did you decide you were most passionate about wiring?
33:18 When did you go out on your own?
37:50 Overview of Hardwire Performance
44:57 Colour coding in wiring
47:41 What makes up a professional motorsport wiring harness?
52:39 Why do we concentric twist our harnesses?
1:07:44 Do you use software for designing your harnesses?
1:11:36 Coupon code
1:14:39 Advantages of an Autosport connector
1:20:53 Tooling required to work with Autosport connectors
1:34:05 What are service loops?
1:42:10 Using glue-lined boots vs non-glue-lined boots
1:46:19 Sizing wire gauge for circuits
2:00:12 Final three questions
Chevrolet Camaro
"... LS thing is kind of cool. So we're finding these Camaros and Corvettes in junkyards and we're pulling the ..."
Chevrolet Corvette
"... kind of cool. So we're finding these Camaros and Corvettes in junkyards and we're pulling the drivetrains ou..."
Ford Mustang
"...hours to to headlight to taillight wire like a 65 Mustang, and I said, all right, this is probably gonna ta..."
Toyota A90
"And then I have what back shells, what boots work with that. So I know, okay, you know I'm going to use this 61 pin and it's always going to be the socket side, it's always going to have this back shell or this boot for a 90 or this for a straight. And I just click on my little thing and enter my part numbers in my list."
Request an Explanation
Heard something you'd like explained? We'll add it to this episode.
Sign in to request explanations for terms you heard.
Want to learn more?
Browse our glossary for plain-English explanations of automotive terms, jargon, and concepts.
Help improve this episode
See something that's not quite right? Our annotations are AI-generated and can sometimes miss the mark. Click the flag icon on any annotation to suggest a correction.