I have answered your question...your chassis uses 15A spec. for the OVP protection Fuse.
Maybe a picture will help.

http://catalog.peachparts.com/ShopByVehicle.epc?q=1996-Mercedes--benz-C--80-Body--Electrical&yearid=1996%40%401996&makeid=63%40%40MERCEDES%2DBENZ%40%4063%40%40MERCEDES%2DBENZ%40%40X&modelid=6335%3AMBC%7C1556%3AED%7C10000015%40%40C280&catid=241959%40%40Body+Electrical&subcatid=242003@@Overload+Relay&mode=PA

__________________
A Dalton