Hey bud, With all different circuits being effected as they are , you have a earthing fault. Check your earth between body and - batt and to engine also.
Try looking into the Transmission Range Sensor. I had the problem of my radio cutting out when I went into reverse. Then, it also went out when I braked and sometimes when I turned corners. Then it went out all together. At about the time this happened, my fasten seat belt light started flickering. The real concerning part for me was that my Power Steering has become unreliable too. Other things that have gone wrong all at this same time are my window wipers and my power windows. I've been looking for help on this site and found these two questions (adresses pasted below) and think it might be the same thing, although I haven't had the chance to try this and see if it fixes it.
http://www.faqfarm.com/Q/Why would a %2796 Taurus lose power steering and radio
http://www.faqfarm.com/Q/Why the power steering gets stiff and the power windows and stereo will not work when my 1997 Taurus is in gear
I would say 1 of your door switches are bad or your door doesn close all the way.
Sometimes when cornering, the overhead lights will flicker on in that model car. This is due to a flaw in the switch mechanism design, which holds the relay connection slightly apart from the bulb (when they touch the light is energized and turns on). When the car turns the centrifugal force will bring these two points together and the light turns on. To fix this, remove the plastic dome and switch cover and look for a tightening screw. If there is not a screw, you may be out of luck. If there is, tightening it should prevent this random flicker.
Fuse connections. The connectors for the dome light in the fuse panel get loose, you can try and bend them back with a small screwdriver to make the connection again.
I would replace the headlight switch as Ford has had their share of these problems.
Not enough info... If the lights are dim, there is an illumination wire that dims the lights when the headlights come on at night... could be a bad switch. If your lights are totally gone... so is your radio. It is a sealed unit not meant to be serviced. Even if you could find someone to repair it, by the time you were done, it would be cheaper to buy an aftermarket or an original factory Delco from eBay.
check the dash board ground connection...it may be loose
The alternator is on its way out.
most likely the harness on the side of the radio, drivers side, has chafed through, pull radio and tape over the wires attached to the side of the radio.
Might be a weak battery
you may have already checked, but to me it sounds like you have a loose connection at the battery
bad or failing alternator
Check the switch at the brake pedal .
On my Lexus I had an issue with the lights staying off when it was cold. This was the case for all of my dashboard lights. Then they would flicker back on. There are Caps on the board for the instrument panel that were blown. This was the case for my fuel cage that didn't work consistently work as well
If all of the lights flicker I would check for a loose or corroded ground. If only 1 light flickers then check to see if the bulb is properly plugged in to its socket, or if there is dirt, corrosion or rust causing a poor connection.
Most probably, a loose wiring connection.
bad wire connections inside the fan
Had that problem when still under warranty on my 02 when all lights would momentarily flicker, including the head lights, and the dealer replaced my alternator. There was a service bulletin put out on that problem. Also just recently, my lights would dim and I found a broken ground wire on the left front side on my engine block after checking all ground connections. Good luck.