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That's true, and if one glow plug fails open, the voltage drop across the hot wire "resistor' will decrease and the voltage to the other GP's will be higher, shortening their life. You may notice a less bright indicator also, because of less current flow through the 'resistor'.

I found there were several people that had questions about replacing a hot wire indicator for their glow plugs and thought I would try to help. . It is called Nichrome (Nickel Chromium) wire and its been around since 1906. It was the first wire used for resistance heating elements. It is...