- 1). Isolate the electronic piece you want to test. You likely access to the guitar's cavity to safely unsolder the wires attached to the pickup or the potentiometer on which you are going to use the multimeter.
- 2). Attach the black lead to the common terminal on the multimeter and the red lead to the V-ohms-diode terminal. On some multimeters, the black lead plugs into the outlet, and the red lead goes into the "+" outlet. Plug in the multimeter once these pieces are attached properly.
- 3). Choose the desired multimeter setting. For guitar applications, measure resistance, ohms.
- 4). Touch the tip of the black multimeter lead to the ground wire of the pickup you want to test. Touch the red wire to the hot wire. If testing a potentiometer, place the pot on its side, so that you are facing the back of the pot, with the wire connectors facing up. Touch the black lead to the connector on the far left, and then touch the red lead to the connector on the far right. Allow a few minutes for the reading on the multimeter to stabilize. Write down the reading.
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