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How does Toyota glow circuit work?

Updated: 8/18/2019
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14y ago

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A typical glow plug circuit energizes a timed relay when the key is turned, after the preset time has expired ( about 10 seconds ) the light to allow starting is illuminated.

Glow plugs are not like spark plugs, they only need to be energized when the engine is cold, and only then long enough to heat them up once, after that the heat of the engine is enough to cause combustion.

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Q: How does Toyota glow circuit work?
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