124s and later 126s used a combination relay that handled turn signal and defroster timer in one package. It is in the fuse/relay box, tag N10. They actually install a dummy clicker coil in the cluster, or you would not hear your turn signal, since the relay is under the hood.

123s and early 126s had a defrost timer behind the cluster and a turn signal flasher under the center cluster.

If your 126 fuse box is recessed into the fire wall you have the early version. If your fuse box is a large black enclosure under the hood you have the later version.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech