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Here is what another did to fix the problem: " just checked all my fuses, all were good. I checked the bulbs, all were good. I checked to see if I had power at the plug into the lamp, no power for the running lights. Hopped under the rear bumper and found where someone had done a crummy
repair on the brown wire coming in on the main harness and it split off to two brown wires to each light and fixed the repair and lights work now. "
Probably a frayed ground wire, shared with other idiot lights (both check engine lights, brake system fault light, low oil level/pressure light) and the fuel pump. It is a multi-stranded wire that passes over the top of the transmission on the way back to the fuel pump mounted on the rear, center, of the fuel tank.. As the strands break due to flexing, various idiot lights intermittantly come on, until enough strands break to make them stay on, then finally stopping the fuel pump from pumping. Repair the frayed ground wire (most likely as it passes over the transmission), and everything goes back to normal.
The AutoZone website may have a wiring diagram in the sites self help repair section.
If you have a voltmeter check for voltage and ground continuity at the bulbs. Check for voltage before and after the brake switch (operate the switch). If you don't have a voltmeter connect something up with a 12V bulb.
If you have voltage after the switch (when operated) but none at the bulb might check the brake/tail light sensor. This is the actual sensor box located in the trunk, drivers side. The sensor can fail resulting no brake lights.
There have been various posts at this forum on the sensor, suggest you do a site search to find these and review them.
check that you have brake lights. fords are well known for wire to brake light switch breaking, repair wiring if broke. replace brake light switch if not working brake lights and wire ok and fuses ok. recommend checking with test light before replacing. just ground test light clip, touch 1 side of switch and should light up tester, other wire should light up only when applying brakes. if this doesnt solve issue, seek professional help via electrical repair shop or ect...