Quoted from dmacy:All flashers work with exception of two by flippers.
Well then the A/C relay is working, if it was not working then none of the flashers would work. You didn't say which flasher wasn't working.
Quoted from dmacy:I on the right path or is there something else that actually is driving the A-C select other than Q8?
This turns on the relay giving power to the flash lamp bulbs, but you still need another transistor to turn on to apply the ground to complete the circuit.