Mattsz, I'm pretty sure the small red wire is the path from the battery to the whole system. You can check this by disconnecting the square connector. I bet the piece attached to the solenoid reads 12v and if you turn the key absolutely nothing will work because you've detached the main power line. I also bet there will be no continuity between the other two small lines and the red one. The red one connects to the positive battery cable. Scott
Its a pretty skinny wire - but it could be doing so.
And we are surprised by that ,why ?