Practical Harness Construction - Club Level

This course gives you the knowledge and skills required to design, spec and build a complete, affordable EFI wiring harness for your modified street car, or club level track car from scratch.

You will learn how to design the power supply, grounding, sensor and actuator circuits to ensure the EFI system functions flawlessly, the harness is protected, and you’re not plagued by electrical gremlins down the line. You will learn how to route the harness through your engine bay and interior, ensuring a tidy, strain free fit. You will learn how to create a harness transition point, and when you should transition the harness from a main trunk to the individual sections that connect to each part of the system. You will learn how to lay out and organise all the wires that form the harness, how to bundle and branch them, how to sheath them, and then terminate them to the correct connectors.

EFI wire harness(loom) construction is a complicated task, involving several specialised skills, these are skills that ANYONE can learn. With a small investment in tools and the correct guidance there is no reason why you can't create a reliable, good looking, functional looms for less than the cost having one made by a professional. 

After demonstrating the key design and construction techniques required, we bring that knowledge together into our HPA 8 Step Harness Construction Process. This process breaks down the complication into 8 manageable steps, that when completed in order, with attention to detail, result in a tidy, robust, reliable wiring harness. You will watch as we demonstrate a complete harness build from scratch, showing every step of the process in detail to ensure you will have the required knowledge to tackle your own project.

This course is applicable to ALL makes and models of engine management systems. Whether you are wanting to build an EFI harness for a torquey V8, or a high revving 4 cylinder, the knowledge presented in this course is completely applicable.

This course is designed equally for the home enthusiast that wants to build their own wiring harness, or a professional tuning shop that wants to bring their harness building in house, getting better control over the process and timelines. We dispel the myth that EFi system wiring is a black art, requiring thousands of dollars in tools and materials. We show you how to achieve a professional and reliable result using general purpose electrical tools and commonly available materials.

This course builds upon the knowledge presented in our EFI Wiring Fundamentals course to give you a complete process to design and build and EFI wiring harness. If you have not yet completed that course, you should start there.

What you will learn
  • EFI Wiring Harness Circuit Design
  • Harness Routing
  • Wire Preparation, Splicing and Layout
  • Harness Bundling and Branching
  • Harness Sheathing (Heat-shrinking)
  • Harness Testing and Installation

Common Questions

Is this applicable to my ECU and vehicle?

Yes, this course is applicable to any ECU and any platform.

How long do I have to watch the course videos?

Once purchased you have LIFETIME access to your training courses. Lots of our customers use these course videos are reference material throughout their tuning/engine building/wiring careers.

Do I get a certificate?

Yes, we provide a digital certificate of completion with every course you complete. This is great for the workshop wall or CV.

Can I watch the course videos whenever suits me?

You can access your course material via our website, 24 hours a day, 7 days a week, 365 days a year.

Does this course include concentric twisting?

No, this course is a club level course. Building a 'mil-spec' loom with concentric twisting is much more involved in regards to both time and the required tools. Concentric twisting will be covered in another course early 2019.

Buy this HPA course and get 3 months Gold membership free!

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Course Curriculum

  • Introduction 03.40
  • How To Use This Course 01.29
  • Disclaimer 01.03
  • Standards of Work 01.37
  • Preparing Your Workspace 02.54
  • Component Inspection and Physical Mounting 07.15
  • Power Supply Design 08.58
  • Grounding Design 08.30
  • Sensor Design 07.20
  • Actuator Design 07.57
  • Network Communication Design 03.17
  • OEM Integration and Auxiliary Connections 03.56
  • Materials Selection 04.20
  • Harness Routing and Branching 10.49
  • Preparing Documentation 03.30
  • Wire Preparation 03.46
  • Twisting Communications Wiring 03.54
  • Splicing Supply / Ground Wiring 06.09
  • Splicing to Shielding Braid 12.41
  • Bundling and Branching 15.07
  • Installing Sheathing 14.20
  • Booting Preparation 04.49
  • Labelling 04.46
  • Crimping Terminals 07.03
  • Pinning Connector Bodies 02.57
  • Design Confirmation Testing 03.59
  • Step 1: Specifications and Circuit Design 08.07
  • Step 2: Layout and Routing Design 10.45
  • Step 3: Wire Preparation and Splicing 08.17
  • Step 4: Wire Assembly, Bundling and Branching 09.38
  • Step 5: Sheathing 09.28
  • Step 6: Booting Preparation and Labelling 11.52
  • Step 7: Terminating and Connector Installation 17.50
  • Step 8: Testing and Final Installation 09.27
  • Conclusion 01.20
  • Request Certification 00.06

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