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Direct links to the original Prusa electronics assembly guides: MK3 (B3/R2 design), MK3 (B7/R3 design), MK3S.

There are two versions of the PSU wires, make sure you identify which are the positive and the negative wires. This is extremely IMPORTANT.

Both wires on each pair are black, the POSITIVE WIRE is marked with a RED LINE along its length.

For each pair there is a red and a black wire. The POSITIVE WIRE is FULLY RED (you might still see a little black line).

The wire terminals must be oriented correctly when you connect them to the board. The 2nd image shows the CORRECT orientation. The 3rd image shows the wrong orientation.

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