We were delighted to work with The Parrott Bros Rob and Dom Parrott, when they brought their MK MX5 kit car to us for a bespoke electrical system to be designed, built and installed in their pride and joy. The system includes our LOGIC 1H, which includes wiper control, electric handbrake control and RF switching options as well as everything required to control the vehicle except the engine itself which is controlled by their custom-built ECU.
They were put in touch with us by MoFast owner Paul Aspden who has one of our LOGIC 10 BCMs in his Caterham.
This page will document the processes we went through using images and video links.
Building a wiring harness - for beginners: Part 1
The wiring is usually the one thing people dread having to do, and when they do think about it, well it can only be a few wires from here to there can’t? Just a few wires to get things going that’s all we need!
But just think about it for a little longer; is it? What does the wiring system really do anyway? A lot more than you might think, or at least it should...
The first thing is don’t be afraid of it and then whatever you do don’t dismiss it, if you do - you do so at your peril.
Whatever reason you want to build or have built a harness, I am pretty certain it’s not so you can spend hours fault finding or stuck at the side of the road or even thinking I wish that worked better.
Automotive wise the wiring and electrical systems are the only parts of a car that have changed in terms of their influence on the function of a car in the past 60 Years. The Electrical system now plays a major part in a vehicle’s drivability, power delivery, economy, safety and, don’t forget, ergonomics (the nice bits were your seat warms up and your IPod connects to the radio). Even the most hardened petrolhead secretly craves a little functionality and comfort.
If you take a little time to understand the electrical system and the regulations, not necessarily learn all about it, but just understand what it does, what it can do and what you must do, then you will start to understand what you can do, and why those tittle extras are worth the time and effort.
Designing and building or even having a harness built to your specification can be one of the most satisfying parts of the car build and the finished car, having the right function how you want them and those little extras is as satisfying as a perfect fitting chrome trim, those well-tailored seats the or that crisp sounding inlet system.
Once again don’t be afraid of the wiring break it down into easy to bitesize sections to avoid overwhelm.
When designing a harness there are 3 main things to consider: -
Designing a wiring harness from scratch – 1st Stage
If you DIY the next phase is to decide on the connectors: See Part 2.