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Hello and thank you for your question,What year is your Ranger?What are you calling the center lamps?
Curtis, The black wires are all grounds but the turn signal are separate circuit for both sides. See the wiring diagram in the link below. Copy and paste the link to your browser to open and view the diagram. have a look and see if this is what you need.https://dl.dropboxusercontent.com/u/104923897/Tail%20lamp%20Dec%2029.pdf
The back up lamps are the black/pink wires. See the link below.https://dl.dropboxusercontent.com/u/104923897/Back%20up%20Dec%2029.pdf