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Remove the interior light from the roof and you should see a wiring plug on the outer/inner case, three wires, Door ajar -Green orange-12 volt, black-ground supply, cut a piece of wire and attach one end to a metal part in the car, grip it on, my suggestion is under the dashboard the steering mount frame. This should provide ground power to the line. reattach the interior light to its loom and then attach your loose ground wire to the rear of the hyundai loom on the black line, press frimly so wire doesn't come loose. Now put the interior light in the on position, if it lights up when you turn it on an off then your problem is the ground supply to the interior light, radio etc. Firstly find out exactly what's wrong then we'll sort out the rewire issue.
Good Luck
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