There is a relay on the later 123s (with the small hazard switch) which is located under the console, fwd and too the left of the shifter. Had to replace that on my 85 240D to make my turn singles work.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"