Left side is Ohms. You need your common wire (black) in the center. The red wire in the Ohms. Then you can check for Ohms. When checking Ohms the item your checking must be pulled out of the circuit otherwise you are testing the entire circuit.
Other side is volts. Must move the red wire also.
The number shown on the meter is the maximum for that selection. So if you have something that should be 18Volts start at 20. Etc, etc.
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-Ryan
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