Tractor Glow Plug Wiring

Written by johnathan cronk
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Tractor Glow Plug Wiring
Learn how to proprerly wire glow plugs to ensure wires do not get mixed up or crossed. (Hemera Technologies/ Images)

Diesel tractors are equipped with glow plugs to warm and start the engine much like a diesel truck or vehicle. The number of glow plugs within the tractor engine will depend on the number of cylinders it has. There is one glow plug for each cylinder. If you notice the tractor is hard to start or not starting properly, the glow plug wires may be damaged or worn. Replacement of the tractor glow plug wires requires no tools and can be done by buying glow plug wires from your local tractor manufacturer or store.

Skill level:
Moderately Easy

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Things you need

  • Replacement glow plug wires

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  1. 1

    Turn the tractor engine off and if it was recently driven and allow at least ten minutes for the glow plugs and surrounding components to cool. This will prevent serious burns.

  2. 2

    Lay the replacement glow plug wires out on a flat surface from shortest to longest. This will make the matchup and replacement process easier.

  3. 3

    Locate the first glow plug to wire. Always start at one side to avoid wire mix-up or crossing. The number of glow plugs and location will vary based on tractor manufacturer and engine size. Remove the glow plug wire from the glow plug by gently tugging on the wire at the boot where the wire meets the plug.

  4. 4

    Trace the wire to the glow plug relay and unplug it. Depending on the engine model there may be a tab to depress to remove the wire.

  5. 5

    Match the old plug wire to the new wires to find the correct length for that specific plug. Plug the wire into the glow plug, route the wire the same way as the old one and plug it into the glow plug relay. Repeat these steps for each glow plug wire.

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