The moisture aspect had occurred to me as well, which was one reason I bought the Huoco relay, which has the correct orientation for a w123 - that is, the harness with the plugs and electrical connector comes up from below, meaning the relay cover should prevent most or all moisture intrusion (the blank end of the cover faces the windshield when installed).

If you use a relay not from a w123, some are oriented to have the harness connect from the other end of the relay, meaning that the open end of the cover is facing up and toward the windshield, where it is vulnerable to moisture.

I know that Clacker, who lives near me, has had the same issue on at least one OM617 relay. I am just curious if it may be a localized issue due to our area's climate, which is moist all year 'round (humidity all summer, lots of freeze-thaw cycles and of course snow in the winter months).

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22