Ohm meter tests are not an effective method in circuits where high current is flowing. All you need is one tiny remaining spot of contact to get close to 0 ohms, but you will not get enough current to flow through that. Now that you have me here, lets do voltage tests instead.
I just started a conversation with another Ford owner with the same problem, so please forgive me if I get mixed up. A test light will be more accurate for these tests because it forces current to flow through the circuit. If you only have a digital voltmeter, we will get by with it, but when you take readings, turn the circuit on, then retake the readings. The circuit will try to draw current, and the voltmeter will show the results of a defect.
Your ignition switch connector can have up to four light green/violet wires. All of them must have twelve volts all the time. If that is missing, check fuse 107 under the hood. Leave the connector plugged into the switch, and back-probe the wires through the back of the connector.
If you do find twelve volts on those feed wires, turn the switch to "run", then back-probe the black/light green, the red/light green, then the green/yellow. All three should have twelve volts.
Wednesday, March 1st, 2017 AT 4:48 PM