With the black terminal still on the first end of the current, press the exposed, red terminal on the other end of a linear current, like a second end of the wire or second fuse terminal. Place the red terminal on a separate part of the fuse, wire, or other end of the device. Take any removable fuse out and test any hooked up wire by turning the appliance, car, or device off first. Don’t worry about turning these off if they’re not already installed in something. You obviously can’t unplug a wire or fuse.Wait at least 1 hour after unplugging these systems before testing them. Some devices, like hot tubs, radios, or car systems, will store a charge even after the power is off.If you’re testing an outlet that is already installed, flip the breaker on the fuse box for the room that the outlet is in to shut off the current.If there is another current on top of the signal being sent, the multimeter won’t read the correct resistance. Continuity is tested by sending a small current through the 2 terminals and reading the resistance on the current. Not only is it dangerous to test continuity when an active electrical signal is flowing through an outlet, wire, or power source, but it won’t even work. Turn off and unplug the device that you’re testing.
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