Find our guides useful?
- Choosing a selection results in a full page refresh.
This Tefzel wire size guide explains common M22759/32 wire sizes used in motorsport, performance automotive, EFI, ECU, sensor, dash, CAN bus and custom harness wiring.
M22759/32 Tefzel wire is commonly used in motorsport wiring because it is lightweight, heat resistant, thin-wall, abrasion resistant and suitable for compact harness builds where normal automotive wire is too bulky.
For most ECU signals, sensors, CAN bus, switches and low-current wiring, 22 AWG and 20 AWG Tefzel wire are commonly used. For higher-current circuits such as small outputs, relays, solenoids, fans, pumps and power feeds, use larger sizes such as 18 AWG, 16 AWG, 14 AWG or 12 AWG depending on current draw, wire length, voltage drop and circuit protection.
The table below gives a practical guide to common Tefzel wire sizes used in motorsport wiring harnesses. Always confirm the final wire size based on the actual current draw, wire length, fuse size, environment and installation method.
| Wire Size | Approx. Metric Size | Typical Use | Common Motorsport Applications |
|---|---|---|---|
| 22 AWG | Approx. 0.35 mm² | Low-current signal wiring | ECU inputs, sensors, CAN bus, switches, dash signals, data logging |
| 20 AWG | Approx. 0.5 mm² | Signal and light-duty output wiring | Sensor power, ECU outputs, small relays, low-current devices |
| 18 AWG | Approx. 0.75 mm² | Medium-current wiring | Injectors, coil triggers, solenoids, small loads, relay feeds |
| 16 AWG | Approx. 1.3 mm² | Higher-current wiring | Fuel pump triggers, ignition feeds, PDM outputs, medium accessory circuits |
| 14 AWG | Approx. 2.0 mm² | Power wiring | Pumps, fans, ignition power, higher-current outputs, accessory feeds |
| 12 AWG | Approx. 3.0 mm² | Heavy power wiring | Main feeds, higher-current PDM outputs, fan feeds, pump feeds, power distribution |
For a clean motorsport harness, the goal is to use the smallest practical wire size that safely handles the circuit current, voltage drop and protection method. Oversizing every wire makes the harness heavier, bulkier and harder to route. Undersizing wire can create voltage drop, heat, reliability issues and fault problems.
22 AWG is commonly used for low-current circuits such as ECU sensor inputs, switch inputs, CAN bus, data logging, dash wiring and other signal wiring. It is one of the most common sizes used in lightweight motorsport harness work.
20 AWG is useful where a little more capacity or mechanical strength is wanted compared with 22 AWG. It is often used for sensor power, ECU outputs, small control circuits and light-duty wiring.
18 AWG is a good middle-ground size for many moderate-current automotive circuits. It can be used for injectors, solenoids, relay trigger circuits and small powered devices depending on the actual load.
Larger sizes are used for power feeds, higher-current PDM outputs, fan wiring, pump wiring, ignition feeds and other higher-current circuits. The correct size depends heavily on current draw, fuse size, cable length and voltage drop.
M22759/32 wire uses a number-based colour code. This is commonly used when identifying wire part numbers and ordering colours.
| Colour Code | Wire Colour |
|---|---|
| 0 | Black |
| 1 | Brown |
| 2 | Red |
| 3 | Orange |
| 4 | Yellow |
| 5 | Green |
| 6 | Blue |
| 7 | Violet |
| 8 | Grey |
| 9 | White |
Tefzel wire is generally thinner, lighter and more heat resistant than standard automotive wire. This makes it useful for engine bays, race cars, motorsport harnesses and compact wiring looms where space, weight and reliability matter.
Standard automotive wire can still be suitable for many basic automotive jobs, but for motorsport, EFI and professional harness work, M22759/32 Tefzel wire is often preferred because it allows a smaller, lighter and cleaner harness.
12Volt Motorsports supplies M22759/32 Tefzel wire for motorsport and custom automotive wiring builds. Available in multiple AWG sizes, colours and roll lengths.
Shop all Tefzel Wire22 AWG and 20 AWG Tefzel wire are commonly used for ECU wiring, sensor wiring, switch inputs and low-current signal circuits. Larger sizes are used when the circuit current is higher.
M22759/32 is a common specification for lightweight, tin-plated copper, crosslinked ETFE insulated wire. Tefzel is commonly used as a trade name for ETFE insulation, so many motorsport wiring suppliers refer to M22759/32 as Tefzel wire.
Yes, 22 AWG Tefzel wire is commonly used for low-current sensor wiring and ECU signal wiring. Always confirm the actual current draw and wiring requirements for the device being connected.
Colour choice depends on your wiring standard and how you want to identify circuits. Many builders use black for grounds, red for power feeds and other colours for sensors, outputs and signal wiring. The most important thing is to document the harness clearly.
Yes, M22759/32 Tefzel wire is commonly used in engine bay and motorsport harness applications because it is lightweight, compact and heat resistant. It should still be protected correctly with suitable sleeving, heatshrink and routing.
Not every wire needs DR25, but motorsport harnesses commonly use Raychem DR25 or similar sleeving to protect wire bundles from heat, abrasion and chemicals. DR25 is often used with Tefzel wire in professional harness builds.
Last updated: June 2026
Find our guides useful?
Thanks for subscribing!
This email has been registered!