Electrical connector? Are you tapping into the line that goes from the manifold, to a valve and to the ALDA? (flatish metal colored part next to the the white valve I posted the picture on). If so that is the turbo line, not the vacuum line.

A simple test would be to find the black vacuum line that leads down to the trans. See iff that holds vacuum. If it does, unplug it and cap the rubber 2 or 3 way that it came out of. Then take the car out for a drive. If it starts to clunk when you come to a stop and also holds the shift longer than it now does, then it is in your adjustments.

If the line to the trans doesn't hold vacuum in your test, then the modulator is leaking, most likley the black cap that covers the tee adjuster.

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it