# BLTouch Failing M48 Test **URL:** \ **Category:** 3d Printing / Slicers / Setup / Problems\ **Created:** [December 23, 2020, 7:45pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876 "2020-12-23T19:45:00Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Ender5r](https://avatars.discourse-cdn.com/v4/letter/e/b4bc9f/32.png) [@Ender5r](https://forum.makewithtech.com/u/Ender5r)\ **Post date:** [December 23, 2020, 7:45pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876/1 "2020-12-23T19:45:00Z")
In the past few days I had a problem with my new BLTouch. It stopped leveling the bed partway through. I would start a print, the axes would home (including the Z), then it would start the 9 point bed level. At point 2 or 3 it would start firing the probe up & down repeatedly and then the LCD would display STOPPED. I looked at a number of things, but the fact that it just started out of the blue made me suspicious it was a hardware issue. After checking other things, like reseating the Z axis limit switch connection on the control board, I homed in on the connector to the BLTouch sensor. Here’s a photo: [ATTACH=JSON]{“data-align”:“none”,“data-size”:“medium”,“data-attachmentid”:7197}[/ATTACH] [IMG2=JSON]{“data-align”:“none”,“data-size”:“full”,“src”:“https://forum.drvax.com/core/image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==”}[/IMG2]​ The thing to notice is the white & blue wire connectors. I had noticed that both of these connectors were exposed when I 1st got the BLTouch, but, because both end connectors looked much the same, I assumed this is the way it’s supposed to look. And, the BLTouch worked, which reinforced the idea that all was well. It isn’t. I used to have 20/5 vision in my left eye & 20/10 in my right so, decades ago, I would certainly have noticed that there are 5 wires but only 4 little plastic ‘retainers’. Since I’m now developing cataracts, and need reading glasses most of the time, I didn’t notice it until looking at the photo. I did not do this: the cable was like this when I got the package. In any case, closeup inspection revealed that the white wire’s connector was not making good contact with the sensor – it had worked loose after a number of prints. I very carefully reseated the connector, paying special attention to getting the white wire fully connected. I looked on Amazon to find a kit of JST connectors the same size as the existing 1. I believe it’s a 1.25mm or 1.5mm, but I’m not certain, and I haven’t been able find a spec sheet that shows it. Also, I could only find 1.5mm connectors on Amazon. I guess I could order the 1.5mm kit and return it if it doesn’t fit, but I don’t like abusing Amazon’s return priviledges. I guess another option would be to use hot glue to anchor the wires in place. I will look in my trove of spare wires & parts to see if I already have the right connector. ​​​​​​​Returning the BLTouch isn’t really an option because I ordered it off AliExpress… it would take forever to get a new cable. ![_MG_3729.jpg](https://canada1.discourse-cdn.com/flex035/uploads/makewithtech/original/1X/79651d276b292a9b82f00ad3d2aec8d2e61dc4cf.jpeg) ---
**Author:** ![Larry](https://avatars.discourse-cdn.com/v4/letter/l/47e85d/32.png) [@Larry](https://forum.makewithtech.com/u/Larry)\ **Post date:** [December 23, 2020, 8:11pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876/2 "2020-12-23T20:11:39Z")
@Ender5Pro The photo did not show up in your post. ---
**Author:** ![Ender5r](https://avatars.discourse-cdn.com/v4/letter/e/b4bc9f/32.png) [@Ender5r](https://forum.makewithtech.com/u/Ender5r)\ **Post date:** [December 23, 2020, 8:58pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876/3 "2020-12-23T20:58:21Z")
Hope it’s there now. ---
**Author:** ![Larry](https://avatars.discourse-cdn.com/v4/letter/l/47e85d/32.png) [@Larry](https://forum.makewithtech.com/u/Larry)\ **Post date:** [December 23, 2020, 9:50pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876/4 "2020-12-23T21:50:59Z")
> [@Ender5r](#): > > Hope it’s there now. Yep it is. Yea white pin tab is broken off will let pin slip up. not good ---
**Author:** ![Ender5r](https://avatars.discourse-cdn.com/v4/letter/e/b4bc9f/32.png) [@Ender5r](https://forum.makewithtech.com/u/Ender5r)\ **Post date:** [December 23, 2020, 9:53pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876/5 "2020-12-23T21:53:04Z")
I will likely have to use hot glue. I checked my stock of spare cables/connectors. I have 4-pin & 6-pin of the right size, but no 5-pin [SIZE=20px]??[/SIZE] ---
**Author:** ![roon4660](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.makewithtech.com/roon4660/32/35_2.png) [@roon4660](https://forum.makewithtech.com/u/roon4660)\ **Post date:** [December 30, 2020, 12:30pm UTC](https://forum.makewithtech.com/t/bltouch-failing-m48-test/2876/6 "2020-12-30T12:30:26Z")
I sympathize with Ender5r for his cataract problem. 21 years ago when I got hit by lightning I got cataracts in both eyes but the left eye formed super fast so that I was blind in my left eye and could see a yellow tinge in my right. I was relieved when that was removed and I could see again. The right one seems to have faded away over the years.