Here is the Emergency Flasher circuit for the SC and Carrera years:
Note the difference is the switching between busses 15 and 30 that power the relay through connection 49. In the "old" circuit the switch toggles between 30 - always hot bus and 15 - hot in start and run.
Contact 58 powers the light on the switch from the light switch through a "resistor" it seems.
On the "new" switch, the power from 15 is switched on or off to contact 49 but power from 30 to 49 is not available regardless of switch position. That is why I had to jumper 30b and 49. Then I moved the ground wire to the correct location labeled 31 on the "new" switch (position 58) of the "old" switch. It seems to work now.