Above the passenger foot well on the firewall, up high where it shouldn't get wet even if there's water on the floor

I think there might be a screw (or multiple?) that hold on the very long pin connector.

Why are you removing it? It's very rare for them to go bad.

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,