# Touch Probe Troubleshooting (BB Controller)

**URL:** <https://forum.onefinitycnc.com/t/touch-probe-troubleshooting-bb-controller/10847>\
**Category:** TouchProbe\
**Created:** [February 1, 2022, 5:50pm UTC](https://forum.onefinitycnc.com/t/touch-probe-troubleshooting-bb-controller/10847 "2022-02-01T17:50:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\
**Post date:** [February 1, 2022, 5:50pm UTC](https://forum.onefinitycnc.com/t/touch-probe-troubleshooting-bb-controller/10847/1 "2022-02-01T17:50:44Z")

</div>

This test is for the BB controller version. It does not apply to elite machines.

Let’s test for voltage at the end of the probe wires. With a multimeter you should be able to read from 3.2 to 5.4 Volts DC with the Magnet being DC- and the touch plate being DC+. If that is not present, then the wiring has a break somewhere and needs to be replaced.

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Purchase replacement probe wires here:

> **[Replacement Touch Probe Wire | Onefinity USA](https://www.onefinitycnc.com/product-page/replacement-touch-probe-wire)**
>
> If you need a replacement touch probe cable, you’ll order from Triquetra cnc (the manufacturer of our touch probe), and make sure to select Onefinity cnc. The cable will look just like the one you currently have, not the one pictured. PURCHASE HERE:...

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