Rear defogger not working, cig lighter not working, at light comes on/goes off

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As you can see I have 3 issues. The rear defogger worked at one time and stopped - Checked the fuse and it's ok - The cig lighter worked once and stopped again the fuse is okay - Now I have the AT light, it appears to come on when I turn the key on and goes off when I start the car do I need to worry about this? I've already have replaced a couple of sensors and a ignition coil on the number 4 cylinder I don't need anything else to go wrong with this car seeing it's the only one I have and really can't afford anything else to wrong with it. Any help you can give I will appreciate it very much