Turn signal indicator 64 Barracuda- help me understand

grimreaper said
The only thing I can figure is the switch should provide ground through the turn circuit not turned on at the time and my new switch isn't doing that???
Somebody please explain it to me. Thanks!

For '64 it looks to me like the left and right should both go to the same side in on the circuit board.
Which copper traces on the board are ground?

This one a ground?

If so the circuit is completed through the missing bulbs?