I recently came across some interesting information about Glow Plug Relays. For those who aren't familiar, a glow plug relay is a component in a diesel engine that controls the heating of the glow plugs. When the ignition key is turned on, the relay sends power to the glow plugs, which heat up the combustion chamber in order to start the engine. I found a couple of images that really helped illustrate how glow plug relays work. The first one shows a Motorcraft SW7028 glow plug relay. As you can see, the relay is a small box that is mounted on the engine. It has four terminals which connect to the battery, ignition switch, glow plugs, and engine ground. When the key is turned, the relay sends power to the glow plugs for a short period of time in order to heat the combustion chamber. 
Both of these images demonstrate the importance of the glow plug relay in starting a diesel engine. Without this component, the engine would not be able to heat up sufficiently in order to start. As the weather gets colder, it becomes even more important to make sure that the glow plug relay is functioning properly. In conclusion, the glow plug relay is a crucial component in starting a diesel engine. I hope these images helped shed some light on how this component works, and why it is so important for diesel engines. Remember to keep an eye on your glow plug relay in order to avoid trouble with starting your diesel engine.
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