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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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