Here are the steps on how to locate the glow plug relay:
1. Open the hood of your car.
2. Locate the battery. The battery is usually located on the passenger side of the engine compartment.
3. Look near the battery for a small, black box with several wires connected to it. This is the glow plug relay.
4. If you are still having trouble finding the glow plug relay, consult your car's owner's manual for more information.