I have no brake lights, no turn signals in front or back

SOURCE: problems with turn signals and tial lights

if you have the circuit board type rear lights the circuits inside will brake and cross eachother that will cause your problem

SOURCE: brake lights/rear turn signals not working

chk ur fuses

SOURCE: have turn signals back up lights, brake lights,but

Possibly the headlight switch.

SOURCE: Signals and brake lights dim when brakes applied

it could be a bad connection in the stoplight wiring most likely the earth wire check all the wiring connectors to make sure they are plugged in properly.....hope this helps.....cheers

SOURCE: turn signals going crazy when I push on the brakes

OK, after more than a year of living with this problem, and replacing the turn signal switch (which did _not_ fix the problem), and checking every bulb and every fuse multiple times, I finally broke down and turned my mechanic loose on this problem. He knew right away that it was a grounding issue. He didn't know where, but he hooked up an aux ground to the negative post on the battery and the problem went away. That diagnosed it, the solution turned out to be more difficult as he had to disconnect most of the ground wires connected to the chassis, and wire brush all the spots and then reconnect them all before he finally figured out which it was that was causing the problem. I told him I'd take all those apart again and grease them and then put them back together so they're more permanently fixed. He had seen this issue before, multiple times on GM vehicles. Now I know about it too, and I'm sharing it to hopefully save somebody else some grief.