I had the same thing happen. Solder joint at the connecting pin was broken. Re-soldered and all is working normally again! It is easier to solder if you remove the entire cast hopusing from the car.
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Paul
1991 300TE (280,000)
1985 300TD (432,000 miles - retired)
1976 300D (225,000 - retired)
1975 300D (165,000 - retired)
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