Dell Alienware M14x R2 (Early 2012) - Manual (Page 46)

4 Connect the mini-card cables to the connectors on the mini-card.
The following table provides the antenna cable color scheme for each
mini-card supported by your computer:
Connectors on the Mini-Card Antenna Cable Color Scheme
WLAN (2 antenna cables)
Main WLAN (white triangle)
white
Auxiliary WLAN (black triangle) black
Postrequisites
1 Replace the battery. See "Replacing the Battery" on page 18.
2 Replace the base cover. See "Replacing the Base Cover" on page 16.
3 Follow the instructions in "After Working Inside Your Computer" on page13.
Wireless Mini-Card(s) 48