Just search "OVP"
..

There are enough threads there on OVP to fill phone book.
Notorious failure part that effects power to your engine management systems.

Behind the panel, behind the battery.

http://catalog.peachparts.com/ShopByVehicle.epc?q=1994-Mercedes--benz-C--80-Body--Electrical&yearid=1994%40%401994&makeid=63%40%40MERCEDES%2DBENZ%40%4063%40%40MERCEDES%2DBENZ%40%40X&modelid=6333%3AMBC%7C1556%3AED%7C10000015%40%40C280&catid=241959%40%40Body+Electrical&subcatid=242003@@Overload+Relay&mode=PA

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A Dalton