Date registered: Jan 2007
Vehicle: 1962 W111 220SE Coupe
Location: Cloud City, OR
Mentioned: 1 Post(s)
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Quoted: 8 Post(s)
My car did this on the rear and it was caused by the known issue with construction of the taillight unit. The circuit board thingy inside wasn't attached well enough and the connectors lose contact. Mine would show a bulb out but when I opened the trunk to check the movement would make the bulb work again so I didn't know what was wrong for a while. Next time, gently get out and check your rear bulbs without opening the trunk, just walk around and check.
As mentioned, could also be the incorrect bulb type, same shape and base but not correct wattage, etc. Pull each bulb in the rears and confirm they are the correct type specified in the manual, not just that that match on each side. Someone could have put the wrong bulb in on both sides, I've seen it done quite often. Good luck!
The Coupe Group (W111/112 coupes and cabs)official website
The Coupe Group on Facebook
"Too many people are working at jobs they hate, to buy things they don't particularly want, to impress people they don't even care about." --Dr. Deepak Chopra