BL Touch Configuration
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Can you hear it make a small buzz sound if you send it a command?
Try adding i1 to your the M558 command in config.g to invert the signal. Then try to deploy and retract.
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Have you used M307 H3 A-1 C-1 D-1 to make heater 3 pin available for use? Run M307 H3 by itself to check, it should respond that heater 3 is disabled.
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Tried adding the I1 to the M558, still nothing. The bltouch doesnt make any sounds.
Running M307 H3 returns "Heater 3 is disabled"
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Probably a wiring issue then.
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I've checked the wiring multiple times and even tried a buddies known working bltouch.
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You could try heater pin 7 instead of 3. See if that makes a difference for you.
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Can you confirm that you are running with VIN power applied and the internal 5V regulator is enabled?
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The jumper is on the internal 5v pins, and Vin LED illuminated.
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Can you post a photo showing how the bltouch is connected to the Duet?
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Heres a closeup of the wiring. https://ibb.co/e1hqkS
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The wiring looks OK to me and I didn't spot anything wrong with the commands you are using. The +5V and ground connections must be more or less OK if the bltouch self test works and the red light comes on. So it's either a problem with the orange control wire, or with the heater 3 output on the Duet. When you tried your friend's bltouch, did you use his cable too?
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Sorry its taken me so long to reply, Ive been quite busy and haven't had much time for the printer. The BL touch is now working. I tried a new wire and sure enough, that was it. Thank you for all the help, its been greatly appreciated.