2002 F150 FX 4X4 super crew - headlights work fine, tail lights not working at all, rear turn signals and flashers light up but just barely, front flashers are fine. fuses in the drivers side compart all look good
dont know what to do

 

Look for bad grounds.
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The obvious, check the bulbs.Verify continuity of the fuse (after disconnecting the battery neg.) for the tail lights by pulling the individual affected fuse and ohm it out with an ohm meter. You can't assume a fuse is good by looking at it.If you look in your manual, there will be a fuse layout. Often each fuse supplies power to several different items. If something else is also sharing the same fuse, check its operation which could rule out the fuse without having to ohm it out. Next, if the bulbs check out, I would look for corroded bulb sockets and poor/corroded ground points at the tail lights which is likely to be your problem..