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The outer two wires are power and ground (red and gray on the speaker side, respectively) while the middle two are the speaker level signal from the head unit.
If you have power on the outer two wires, and the dash speakers work, the amps on the door speakers are faulty. Most likely bad solder joints - it happens a lot on these. They will likely be full of rosin, so repairing them will be tricky. More often than not, though, they can be repaired as long as you can deal with all the rosin in there.
If you have power on the outer two wires, and the dash speakers work, the amps on the door speakers are faulty. Most likely bad solder joints - it happens a lot on these. They will likely be full of rosin, so repairing them will be tricky. More often than not, though, they can be repaired as long as you can deal with all the rosin in there.