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Do you have power into the new switch on the white /red wire and the blue wires from the flasher?
The blue wire is the feed wire from the flasher to the turn signals at the switch, do you have power on it ?
At the turn signal switch see if you have power out of the flasher on the blue wire with the turn signal on. While your checking it also see if you have key on power at the turn signal switch on the Purple /orange wire as well as the Lite green/red wire. Post back with the results.
If you have power in to the turn signal switch as you indicate and the 4 ways are working and no power at the blue wire from the flasher to the switch there really is not much else it can be. Are you sure the new flasher is the correct one and just not defective.
I would sure check it, if the 4 way are working that eliminates the switch and the wiring to the 4 lamps.
You know the circuit is okay from the flasher to the switch on the 4 way circuit out to all the lights, the problem has to be in the circuit from the flasher on the blue wire to the switch. You should have battery voltage out of the flasher on the blue wire to to the switch. Unfortunately I'm not there with you to do the testing and at this point I'm not sure why you do not have it.If you would like , I can open the question back up in hopes that someone else has something different to offer.
Take a close look at the crimps , poor crimps are very common of Ford unfortunately. The switch is good, the flasher is good with proper power to it, really does not leave much else.
Your very welcome, I'm getting off right now but I'm here all day tomorrow if you need me.
See the ignition switch in the first link.https://dl.dropboxusercontent.com/u/104923897/Igntion%20switch%20Aug%207.pdfSee the instrument cluster in the link below.https://dl.dropboxusercontent.com/u/104923897/Instrument%20cluster%20Aug%207.pdfhttps://dl.dropboxusercontent.com/u/104923897/Instrument%20cluster%20Aug%207.pdfhttps://dl.dropboxusercontent.com/u/104923897/Cluster%203%20AUg%207.pdf