Read post #11.

Please help me. A friend is in town helping my wife for three days. When she pulled in she had a headlight out on her 2006 Sonata, but had picked up a replacement bulb. Tonight I said I would help her out and put the new bulb in.

I did that easily, but the second I reattached the power supply to the headlight, her radio went completely dead. And then I tried to start the car and it won't start. It looks like some electrical works, like the dash lights, the headlights, odometer, etc. But some like radio, power windows, ignition, are dead. I noticed that the power locks were trying to work but didn't have enough juice to completely click over.

Does anyone have any thoughts? Is it possibly related to the other issues pointed out in the thread, or is it more likely a blown fuse or loose connection somewhere else. Any assistance is greatly appreciated as she is supposed to leave tomorrow night and I feel terrible that somehow my simple bulb replacement has left her car without being able to start.