SOURCE: 2005 GMC 2500HD Both the cigarette lighter &
If you still have your owners manual, it will show you the fuses. Just in case you don't, they are located in the fuse panel under the hood. The AUX outlet fuse is just to the left of the 3rd relay along the top row, the cig fuse is located just below the 3rd relay.
SOURCE: cigarette lighter fuses
they may be running from the same fuse, the units themself may be faultytry replacing them
SOURCE: both of my cigarette lighters
if your owners manual does not tell you where the fuse is, take a multi meter, and use the Ohms setting. you can check each fuse, using the little exposed tabs on the back of the fuse. You will find your bad fuse( I do this all the time for people that loose the owners manual) easiest way to find the fuse, that I have found. If you need more help, let me know. hope this helps
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