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The Glow plugs on a 7.3 Diesel International are located at the top of the intake manifold. There is 1 plug for each of the 8 cylinders and each plug will have a single wire connected to the top of it.These 8 wires go into a harness which leads toward the rear of the engine where you will find the "Glow Plug Controller". The engine I am refering to is a 1988 model, however, I would think a 7.3 is a 7.3. The Glow Plug controller has been a source of trouble on mine but check the plugs first.

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Q: Where are glow plugs located on a 7.3 diesel engine?
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