Ford Repair Questions? Ask a Mechanic for Answers ASAP
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If you take your 12 volt test light and or a volt meter are you getting battery voltage at the red wire on the break light switch?
The red wire should be hot all the time with the regardless of pedal position. Can you check this for me and we can work from there.
Okay the power leaves the switch and goes directly to the third light so it should work if there are no wiring issues and the bulb is okay. For the rear break light the power also goes through another fuse. The fuse is F 28 in the interior fuse panel. Check this next with the breaks applied. See the wiring diagram in the link below for testing reference and let me know what you find.https://dl.dropboxusercontent.com/u/104923897/CV%20break%20light%20Nov%208.pdf
Are you getting the break light signal at the LCM (lighting control module) on the red/white wire (pin #5) with the brakes depressed ?
The LCM is located on the left side of the dash just above the accelerator. See the link below. The third break light dose not run through it and if you have power in and out of the break switch it should work. Lets see if you have power at the LCM on the red/white (pin #5 ) wire . Check this so we can try and narrow this down.https://dl.dropboxusercontent.com/u/104923897/LCM%20Nov%208.pdf