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It is correct that if one plug goes out on a series system, all of the rest quit glowing. However it is generally not because they have failed. It is because the open one has caused an open circuit and the other three can no longer get power!!! Those other plugs should be tested not thrown out!!
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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
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