Intermittent turn signal 300E
 

I am trying to troubleshoot what started as an intermittent turn signal that now no longer works. I have replaced the flasher switch, combination switch at the steering column (new parts), the combo relay and cleaned fuse contacts and replaced the fuses with copper type. I also cleaned all the bulb contacts and checked wiring for shorts or cuts without finding anything obvious. What am I missing? Any help or direction would be greatly appreciated.

Of course both the blinker & hazard signals go thru the lamp module before going to the lamps.