Digital Multi-Meters come in two common varieties: Auto- Ranging, and Non Auto-Ranging. A non auto-ranging meter requires you to select a range of “sensitivity” for the given function you are using. For example if you want to measure resistance, you would need to select a range of up to 200 ohms, up to 20Kohms (20,000 ohms), 200Kohms, etc. An auto-ranging meter will automatically figure out the range and give you a measurement.
Your ignition switch is a rotary switch that when turned to one of its 3 positions connects and disconnects certain contact terminals located on its backside. In the “start” position, it connects the Battery, Ignition, Rectifier, Accessory, and Start Terminals.
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