First thing to check: fuse(s) for the cigarette lighter/power port, which may also be the same fuse for the interior lighting that went out. Could post the location of your fuse box (most Hyundai cars have 2 - one under hood, and a second under the dash (where your power port/interior lighting fuses are most likely located)), if you could clarify which model/year/engine size Hyundai car/truck is giving you problems.
Check fuses they are separate in my jeep under dash then if that doesn't work check relays
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