You know it may be that there is no relay for the headlights in these cars, and all the control is in the combo switch. I'll have to look at a wiring diagram later. I was reverting back to my VW knowledge. .

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine