Here is how to fixed my 99 Deville turn signal flasher.Use simple tool one flat screwdriver and new turn signal flasher part number 3548813 or get it from junk yard (free).

Nice writeup and pics!. I wonder if the flasher for the 94 Deville 4.9 is in the same location. I spent 30 minutes laying on the floorboard looking for it to no avail. Anyone ever changed a flasher on a 94 and can comment?

Thanks

I got my flasher from 94-96 deville.They are the same location.