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I imagine that if the light is blinking the engine most likely has a glow plug out. This can often be tested by removing the preheat harness from the time/relay and using a test light. Attach the clip of the test light to the positive connection of the vehicles battery. Then probe the terminal of each glow plug, you might have to remove insulators and things to get to them. The result, if it lights up its good, if it does not, replace.

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