Add a solder blob on each pin of the DIN-13 connector

Solder the wires following the color code/pinout on the schematics. Start from the lower and use heat shrink tubing on each wire.

Solder the cable shield to the connector shell taking care to not overheat and melt the cable insulation

Close the DIN13 connector.

Solder the wires on the DA-15 male connector. Add a short wire to the cable shield (that will be soldered on pin 14. Use heat shrink tubing on each wire. Add heat shrink tubing around the cable to insulate the shield and get a better appearance.