the combo relay isnt a trad relay. its a circuit board with transistors, capactators with 3 finely spun spools of wire and a lever that creates the magnatic field.

You can get one on ebay for cheap.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)