Reverse engineering 7 segment display
I can't say for sure, but I think the first four signals scan through the four digits, and the other nine pins are the 7-segments (a-g), probably a decimal point (dp), and something else.

Depending on whether it's a common cathode or common anode style will determine the polarity.

What you can do is take 5V in series with a 10k resistor or so and touch a wire to one of the first four pins, and the other wire to one of the remaining nine pins. If that doesn't work, flip the polarity. This will show you which control pin controls each digit and which segment pin controls each segment, and what the polarity is.