turn signal flasher

[Blue jay78]

I have a 1978 Mercedes 450sl and turn signal and 4 way hazard flasher
very fast. I bought a good used hazard switch/relay and still no good.I checked the buibs and all are good.I was told the flasher is behind the dash
cluster, so I pulled the wheel and did not see a flasher unit.So what could it
be.And where is the flasher located?????