I have been suffereing from this exact same issue for weeks now and finally tried unscrewing all my side markers, pulling out the bulbs and making sure to pull out and clean up all wires connected to the sockets (especially the rears). Apparently there is a ground issue with one of the wires touching something it's not supposed to. All I needed to do was make sure to clean up the wires and keep the wires away from touching the body. Re-insert the 4 bulbs and turn on your lights before screwing everything back on. If it doesn't work immediately, try wiggling each of the wires and reorganizing them.
Let me know if that works. My dash and tail lights came back on instantly after doing this.