Hi,
according to the wiring diagram, only 4 poles are connected and must be plugged in accordingly*:
1.) From fuse 5 black-yellow-red cable 0.75 mm²
2.) To ignition starter switch violet-white 2.5 mm²
3.) To reverse light gray-yellow 0.75 mm²
4.) To starter terminal 50 violet 2.5 mm²
...WRe
*https://www.sl113.org/wiki/Electrical/Connectors