There's NO wait involved for power to flow from one to the next. If only one is bad, you can find it by connecting a test light across the connections at each glow plug while the button is depressed.
The light will light, brightly, when connected across the bad GP.
Or, disconnect them and check across each with an Ohmmeter. Good ones will have very low resistance, bad ones, infinite resistance.You can update them to more modern Bosch units. jdemaris has posted about that, I took it one step further on my 424, and added an automatic controller.
Post back, if you'd like more info from either jd or myself.
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