Glen, that install process did not trigger the bulb out MIL on the 126, shouldn't on a 124.
Brandon, I would suggest that you get at least a 45W soldering iron. Its gonna take some heat to melt the factory solder, fairly high silver concentration I think. I started with a 25W iron, couldn't even begin to soften the factory solder. I would also suggest swinging by your nearest MB dealer tomorrow and picking up a couple female socket and 6 pin plugs (if you have already converted to 6 pin for the euros). Part number for the socket is 000=830-19-08 ($1.20 ea), 6 pin socket and and cover #s are 006-545-80-28 and 009-545-30-28 respectively. Total cost for these parts is a whopping $7.20.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.