Front Turn Signal Problem

[Baketown Scotty]

Trying to get all lights on 1966 GMC working to get it registered. All work except the front turn signals and parking lights. My test light lights up at the firewall, where the socket connects to the wiring and when I touch the metal sockets. It seems I have power the whole way but the bulbs won't light. I have new bulbs and have tried both 1157 and 1147. What am I missing?