27 September 2017

There are many ways to trace a bunch of wires from point A to point B. Most of them kinda suck for one reason or another.

Enter the Voltcraft LZG-1 / Extech CT40!

With this gizmo, you can trace up to 16 wires at once. The system uses a remote unit with 17 alligator clips (16 + one for the common/return conductor).

The remote unit sends a 5V pulse width modulated “square” wave to the main unit. Clip 1 is a ~52% duty cycle wave, and Clip 16 is about 98% duty cycle – at 32 Hz. This allows the main unit to distinguish between each wire reliably – as long as the resistance of each wire is less than 30kohms (which is pretty high).

The main unit also doubles as a DMM. Although it’s not the greatest digitial multimeter, it’s good enough for most applications.

This gizmo is VERY useful for things like debugging home electrical wiring, tracing wires in automotive wiring harnesses, and so on.

You can grab one here:

Saved my life on several occasions!

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Easily trace wires with the Voltcraft LZG-1 / Extech CT40
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2 thoughts on “Easily trace wires with the Voltcraft LZG-1 / Extech CT40

  • 27 September 2017 at 13:14

    Couldn’t you make something far cheaper using a LAN tester, now there’s an idea!

    • 27 September 2017 at 17:12

      Maybe, but it would depend on how the LAN tester works (they’re not all created equal), and you’d need 2 LAN testers to get 16 wires. I’m a big fan of getting the right tool for the job to get ‘er done. Ya know, like, “Oh my god! It’s broken! FIX IT!!!” If I have to build the gizmo myself, well, then I have 2 problems to solve. 😉


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