I can only speak for what I know - the left one SEEMS ot have a tendency to fail: the contact from socket to housing (Not socket to bulb) burns down. By applying a light amount of solder to the contact on the socket (after a little burnishing/filing), you build the contact up about 1/32". Just enough so that it looks like the other one.

I have no idea if my fix will last long term, but I suspect it will. Only time will tell.



What I mean is, this is now the fourth time in the past two weeks someone has indicated that the left one has failed on them.