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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