turn signals

[Delorean17@xxxx]

Hello,
For some reason I can not get my turn signals to work. They do not work 
on the 4 way position either. The front two have new sockets and the rear 
have new bulbs with screws through the rivets.(zilla boards are on the way) 
what could be the problem? its as if they are getting no power at all. all 
the parking lights will come on. The fuses are good and the connectors are 
not pushed in. I checked the ground connections near the master cylinder and 
they are clean.

any help would be greatly appreciated.
Thanks
David