I just bought a new 8.4" touchscreen on ebay, and I dont know how to wire it. The lcd itself has 2 cables that extend about 4 inches past the lcd. One is for vga, and the other is a combination power/AV input. It looks lika an s-video connector. Anyway, the lcd shipped with a cable to connect to the power/AV input. In addition to the audio and video inputs, it has 3 spliced power connection wires. One says "+12v", the second says "ground" and the third says "to back a car." How do I power this? Do I connect the +12v and ground to a car adapter (or psu molex)? What do I do with the "to back a car" wire? Please help. I do not want to fry my first LCD. See pictures for details.
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What's this third Wire "to back a car"?