Shortest answer. They are in multiple series circuits with several parallel 120v branches. Thus a single group can fail. The lamps (if they are correct for the string!!!) have a shorting device in each bulb that begins to conduct when the lamp filiment fails. This means all the remaining bulbs get higher voltage than they should. When 3 burn out on the same series segment, the remaining bulbs are given more than enough to fail rapidly. If one whole segment will not light with correct new bulbs it probably has a socket failure. Each bulb has two wires that need to be placed carefully to make contact. (bent around the bulb base). They sell a tool that has the ability to check individual bulbs (battery)and wires for voltage. It is cheap, but also has long directions. My solution is to buy only LED based strings. they do not get hot, and they have 10 times the life span. They are also dimmable with a SCR dimmer. Jim
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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