http://catalog.peachparts.com/ShopByVehicle.epc?q=1988-Mercedes--benz-4--0sel-Body--Electrical&yearid=1988%40%401988&makeid=63%40%40MERCEDES%2DBENZ%40%4063%40%40MERCEDES%2DBENZ%40%40X&modelid=6264%3AMBC%7C1533%3AED%7C10000055%40%40420SEL&catid=241959%40%40Body+Electrical&subcatid=242003@@Overload+Relay&mode=PA

Easy fix..just plugs in.

Use the search feature on top of the page .. "OVP"

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A Dalton