Those plugs are only rated at 9/10 ths of one volt each. If you hit any of them with 12 volts they will blow up instantly.
The system is designed to have five of them all hooked in series. Four in the engine and one on the dash. Each has the same resistance and having five hooked in series keeps the voltage down to safe limits (rarely higher then 2 volts).
Same plugs are used in many old Mercedes cars and Mercedes Thermoking reefer engines.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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