Before you dig for the flasher try cycling the hazard switch a couple times. Sometimes the switch kinda sticks internally and prevents the turn signals from flashing. With all the lighting rework you've done I'd bet the hazards were checked for function recently.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.