Thx, I'll give it a try :-)
I was thinking, I could also test the head light motor alone, disconnect the electric spades and connect a separate 12V battery. I assume that it must be designed like +12V raises the head light doors and -12V closes the doors. Or oppersite.
Then I would need to connect the right choice to Y (Yellow), I assume the wiring diagram would indicate if +12V on Yellow wire would raise the doors or is that assumption wrong? (just asking to get wiser)