2016 gmc sierra cigarette lighter fuse 2014-2018 Silverado Lighter/Power Outlet Key Off Power Mod Cigarette lighter doesn't work in

Generally speaking, the black lead should be plugged into the black COM socket, and the red lead should be in the red V socket (not the red A socket, which tests amperage and wont produce a result here)

If the car is on, the readout may be closer to 14 volts

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If you only have a larger vacuum, cut a toilet paper tube lengthwise so you can form it into a cone shapeone end wide enough to fit over the vacuums tube, the other end narrow enough to fit deep into the socket

[1] Common fuse panel locations include under the hood, beneath the steering wheel, and in the trunk

Run another continuity test with your multimeter in the same way as before