When i received the EBB36* of BIGTREETECH i slowly built up all the connections towards my existing hardware of the Ender 3v2. One information that was missing was the stepper pinout. The manual specifies the port as “E-Motor” but doesn’t show the details. You could derive it from the schematics but still isn’t very visual.
I finally found it here on github:
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Or more visually (please crosscheck the colors with your extruder of choice!)