When the blinker was blinking fast, both front and rear directions were lighting.

I pulled off the plug to the front directional, cleaned off all the crud on both male and female terminals, applied anti-ox grease and plugged back in...then the directional worked fine...slow blinking!!

Thanks

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)