Car will not start and the dash lights are flickering

same problem here as well. I'm going to try and replace the ignition cylinder. Does yours start? Mine starts, but can't get out of park unless I move key to run (put in neutral) and start again, Issue dash is going crazy and running light are flickering. I noticed yesterday that the turn signal lever is hot, so it might be some short in the steering column

loose wire between headlight switch and lights.
Find it before it shorts something out.

Best place to start is the positive lead on the battery . Remove the lead and clean battery pole and terminal using sand paper until you have shiny syrfaces. Replace the lead and tighten the terminal . Check the battery for charge condition as what you describe indicates a flat battery

If the car cranks well then might have a loose connection to dashboard or a bad ground. I don't think this is much help but might be a starting place.

Usually caused by a failing dimmer wheel/rheostat.

First. I would look for a loose connector plug going to one of the fuseboxes, there could be corrosion in the connector even, Under the hood or under the steering wheel. 2nd. I would try to locate the ECM, could also be a bad connector there as well.

Make sure the connections and the cables are good.No corrosion on cables.If the lights in the dash flicker this is usually a sign that the battery is not good or it is not making good contact.Have the charging system and battery load tested.Hope this helps.Good luck.

check the ground wires under the battery tray
you will need to take out the battery and hold down tray.

Like you said, battery may be flat. You can check that with a multimeter.

Next check the alternator. Faulty alternator leads to uncharged battery.

Battery failed.Or alternator problem.Recharge the battery then try..If red light is sill on when car is running then the alternator needs replacing