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High beams on 9004 bulbs are not that great to begin with..they later went to HB2/9003 lamp..much better.

There is a relay listed for that model.

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=21H0MN3YU22A13C8SN&year=1991&make=MB&model=500-SL-001&category=P&part=Daytime+Light+Relay

The question I asked was do the lights come on high/low beam with the stalk
switching to the two positions..the second question is do you have the Pass/Flash working ? That has to have the stalk held all the way towards the driver ..it has no set/lock position..and requires driver holding