The question cannot be correctly answered without knowing exactly what glow plugs you are using.
Some model plugs are dual-element, self-regulating, and blow-out proof.
Others are not and will blow out if held on more then 15 seconds. Some with blow out in one second if voltage is too high.
You didn't mention what model Isuzu. The older Isuzus used in Thermoking reefer engines and some skid-steers have several types of glow plugs available. The choice depends on if you use a glow-plug controller or just a manual push-button.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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