More often than not it's the hazard switch when this kind of stuff happens. They get a lot of abuse in that location, I think that's the reason the 124 has them up by the dash. Make 100% sure the hazard switch is OK before you move on to replace the flasher.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold