The TowReady trailer wiring harness that you referenced, part # 119179KIT, is one of three powered taillight converters that will fit the 1985 Mercedes-Benz 300TD wagon. All can be seen on the link at right. This 4-pole harness is shown in the linked install video, and is one of the items needed to install a trailer brake controller like the excellent Prodigy P2 # 90885.
I suggest you take a look at the linked article on brake controllers; this will further explain why I recommend the... view full answer...
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