Your pcb and plug wont mate!
The pcb header from top to bottom looks like its wired:
logic
gnd
gnd
v+
Your cable is wired:
v+
gnd
logic
Maybe you can find a four pin connector from an old PC or something and swap the housings over by lifting the tabs and puling out the crimped wires.
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A wise man once told me "Never trust a man who doesn't own a shed!"
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Gen 6 daughter board
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Mendel PCB heatbed
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