Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Glow Plug: Operation
Each glow plug will momentarily draw approximately 25 amps of electrical current during the initial key "ON" cycle. This is on a cold or cool engine. After heating the current draw will drop to approximately 9-12 amps per plug.
Total momentary current draw for all four glow plugs is approximately 100 amps on a cold engine dropping to a total of approximately 40 amps after the plugs are heated.
Electrical operation of the glow plugs is controlled by two glow plug relays. Each glow plug relay controls two glow plugs. Refer to GLOW PLUG RELAY for more information.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.