my turn signals do not work on my 2002 Pontiac Grand Prix GT P fuse is good any suggestions?

Disconnect your harness from your tail light and check it with a multimeter

bad bulb osomewhere. they are like xmas.lights ki.da. try your emergency flashers and see what happens. now if the bulb lights but doesnt flash u need a new flasher relay. cheap and easy to change

Start with the basics. Check the light bulbs, double check the fuses, but I have ran into several GMs with Multi-function switch that are bad. Everything dealing with the lights run through it. Double check your hazards and see if they will work by them self . If they do, replace your multifunction switch.