You need to supply the button with power from the batteries so when you push the button power is allowed to go to the glow plugs. The white dots tell you if your glow plugs are working. When the needle goes all the way to the right they are all working, but when the needle goes half way or less you have some bad glow plugs. Google "Official Case IH Parts Store and Case IH Catalog for Parts Search ..." and look up 504 diesel for an electrical picture. Good Luck.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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