My 2014 A4 Avant has a sun visor that doesn't stay up, it flops down halfway, I assume there is some kind of spring inside that has broken. I bought a second hand one off eBay and when it arrived I noticed it doesn't have the wiring and I assume the switch to make the little light come on when you slide the mirror cover over. Other than searching every eBay listing and inspecting the pictures to look for the little wires, is there anyway to tell which should have the wiring/switch and which won't?

thanks
Adam