It doesn't seem possible unless they were wired incorrectly. OEM has five hooked in series. Four in the engine and the other that works as an indicator in the dashboard. If any one of them blows, power is cut to all the rest. So, for four to blow when hooked up that way, they would all have to blow at exactly the same moment.
Those glow plugs are designed to run on less then one volt each (9/10ths of a volt to be exact). Having five in series keeps the voltage down low. If the wiring was changed and enabled a higher voltage to touch any of them, they'd blow instantly.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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