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As with any wiring project, it is important to understand the basics of wiring, and the risks. When undertaking a wiring project, there are various aspects of each situation that you need to be cognisant of.
I think for the time being, it may be best to assume that you are aware of the basics of wiring, but if not, please reference the following building blocks.
- Amperage/Current Draw
- Wire Gauge – Amperage Rating
- Crimping
- Relays
- Reading wiring diagrams.
At the end of the day, it will be difficult to apply this guide to your specific vehicle, as each swap is different, various different configurations, use cases, and end results. As you can imagine, a street car and a full race car are wired very differently.
Another note, for those who are looking for hard core wiring, this is not the place. Horsepower Academy offers an in depth course on creating Mil-Spec harnesses, DR25 wrap, tefzel wiring, and the like, but I assume most hobby swappers aren’t looking to spend $4k in parts on a engine harness.
Okay, now with that out of the way, lets dive into this.
Wiring Diagrams:
Wiring diagrams can be found at the following resource,
https://www.miataforumz.com/how-40/mazda-miata-wiring-diagrams-1990-2002-a-497/
This above link will need to be your main reference, I’ve embedded the systems pdf below for your review. These are for 1990 wiring. There are multiple wiring changes throughout the vehicle, and specific color of the wires may vary.
and the full wiring diagram:
Here we will discuss how I wired my Haltech into my Miata, which signals were needed, and how I utilized the stock ECU wiring for most of the job.
Rotary Miata 