When I did IQ678's fog light mod I tapped into my passenger side city light, so now when I have the passenger side standing lights on and I pull my knob out my fogs light up... Just like my dads GenII w126, and our old E320.

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1981 300TD 4 speed manual
Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light