I narrowed it down to the combination switch. You can get it for 80 bucks at autozone. A quick way to see if it is the switch: measure voltage at the Instrument lights fuse when the combination switch is in park. If no voltage is present, it is the combination switch.
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Well the first thing I would do is check to see if the headlight switch is getting power from the battery-starter. The switch has a circuit breaker built-in for the headlights, and the tail lights are on a fuse in the box under the dash.
American cars traditionally put their dash lights and tail lights on the same fuse so that you would notice immediately when the fuse for the tail lights failed. Find the tail light fuse in your fuse box and check it.
You could have one of two problems here. Firstly if you are getting a christmas tree effect on rear lamp assy ie dull glow from all the lights ,, It's most likely a bad earth/ground connection to lamp,,Secondly if anybody has changed rear bulbs or attempted to fix the problem may have inserted a single contact (21W) indicator/turn signal bulb into the Twin contact brake/tail light socket in error . one bulb (21W) has oposite located pin lugs on side of bulb the double contact brake tail bulb (21/5W) has offset pins. Good luck
You probably have an open/blown tail/park lamp fuse. The dash light fuse gets power from the tail/park lamp fuse, so when you can't see your dash lights, you'll get the vehicle looked at and find you have no park/tail lamps either. It's a safety feature because otherwise you may never know your running lights are not working.
Check your park/tail lamp fuse.