• USB VBUS to boost Vin (red wire)
• USB GND to boost GND (black wire)
• Boost V+ to IDC pins 9 and 10 (blue wire)
• Boost V- to IDC pins 1 and 2 (green wire)
• Boost GND to IDC pins 3, 4, 5, 6, 7 and 8 (black wire)
• Boost EN to switch center pin (yellow wire)
• Boost GND to switch left pin (black wire)

A stripe, usually a white stripe on the PCB silkscreen and a red wire on the ribbon cable, is used to denote the -12V rail in Eurorack modules. This is usually to the left of the notched key on the IDC connector. Some modules may vary though, so always double check before applying power to any of your gear.