http://www.ps2cho.net/downloads/MB%20CD/W124/w124CD1/Program/ETM/ETM.pdf
(AND , it looks like you're gonna have to jumper TWO different sets of Pins.)
(One set for the Head Lamps and a separate set for Tail Lamps)
[I'd sure be studying on this schematic ,BEFORE I jumped any terminals!]
(Errrggghhkkkkk! Stamped on the Schlecht switch is the word "ITALY" ,Ottimo
in things Vino and Donne,less than pleasing in Automotive Electrics.)