New one to me. Makes me think you have current draw someplace you shouldn't, though, check for worn wires in the bundle. Sounds as if the relay "thinks" it's in operate mode when it's not.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!