I finally got it to work... at first I thought it was because i connected that smallish plug. Then I thought about it some more... that smallish plug's wire was quite a stretch from where it was positioned in the fuse box... surely Merc engineers wouldn't have designed it that way... then I realized I also cleaned the back of the PCB for some minor oxidation. SO I went down... disconnected the small plug... and it still works!!! It wasn't the plug after all... it was oxidation which bridged a few circuits.
Having the wiper work resulted in a few other things working too... like the turn signals and flasher.

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project