When you checked the voltage on the wires, how did you do this?
Did you attach meter to ground, and with harness disconnected, touch each lead one at a time? In this scenario, you would get the voltage readings you got...
Did you connect both leads to each wire in the harness? Doing it this way, you should have got around 5.0 volts, but if you got 0.0 volts, that means there is an open in either wire......when you do this test, you should flex the harness wire to see if the voltage drops, indicating a bad connection/open wire....