The tail lights and licence lamp is all the same circuit, should be a brown wire to all 3, it sounds like its broken in the harness somewhere (especially if the front park lamps work, then the fuse and switch are good). Trace back from rear lights until you find power. Check for pinched wires or cut, or bulges in the wire indicating resistence. Also if you have wired in a trailer plug, disconnect it and retry. Trailer wires are very seldomly wired properly and cause lots of light issues.
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