The best manual for the 240 is published by Bentley.
Can't help you with the relay ID, but it looks distinctly aftermarket to me. What stops working if you remove the wires to it or the ground wires?
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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