AutoAfterWorld.COM — The first thing to check is whether the charger or whatever it is you're plugging into the outlet isn't the problem. Try plugging it into a different outlet to see make sure it's working.
Once you're sure that what you're plugging in isn't the problem, check to see if the fuse for the power outlet has blown. A blown fuse for that circuit is the most likely cause, either because of age or because what was previously plugged in drew too much current.
If you don't know where the fuse is located, consult your owner's manual to find the location first of the fuse panel, then of the individual fuse for the power outlet. You may need a fuse puller to check it, though some vehicle manufacturers thoughtfully include one in the fuse panel. If the fuse is bad, replace it with one of the same amperage.
Even if the fuse shows no signs of being blown (one such sign might be a black spot), you might want to try a different fuse of the same amperage to make sure.
If the fuse is good, you have more work to do. Check whether power is getting to the outlet by testing it with a voltmeter or circuit tester. If the voltmeter shows power is reaching the outlet, the outlet itself is probably damaged from repeated use or simple misuse. Though chargers and other plug-ins are supposed to be of uniform size, some may be bigger or smaller than others.
If no power is reaching the outlet, the problem lies elsewhere, such as in a disconnected wire or worn insulation on wiring. The wires may be out of sight or hard to reach under the dashboard, but see how far you can trace them to try to find the problem.
If you can't find what's wrong or are unable to fix it, professional help is your next step.
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