Measuring resistance can indicate the health of a component. For example we can determine if an ignition coil is healthy or not by measuring the resistance of its windings. To measure resistance, set your meter to Ω ohms resistance. If you need to select a range, select the smallest range normally 200 ohms. Place the red probe onto one of the small terminals of the ignition coil, and the black one on the remaining small terminal. Your resistance will then display. A normal ignition coil should read about 3.5 to 4 ohms. If your meter reads a much higher resistance it means your ignition coil may have a short and is faulty.
So your tractor lost spark. You purchased a new ignition coil. After you installed it you still don’t have spark. What happened? We will go into this common problem later in the article, but for now remember never make assumptions. Always look for evidence that suggests a cause. Evidence comes in many forms such as smoke coming from your engine, metal particles in your oil, and oil leaks from your transmission.
D-42 - Engine Wiring Diagram Specialist
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