I don't remember off the top of my head. WOuld have to look at the schematic again. You could use a digital multimeter and play source material, noting which lead is attached to what wire. If the meter measures your DC voltage output as positive, you know ,by your meter leads , which one is positive and negative. I no longer us any of the factory wiring as my system is totally aftermarket now. The only thing stock is the handlebar controls.
As far as the crossover , I lefet mine normal. I can adjust individual frequecies through the head unit.