300M Dash Gauge Lighting

Is it only the gauges or the all the instruments and heater controls? The first place I'd look at will be the dimmer switch. Normally the instrument lighting shares the same circuit as the parking/valet lights.

there is a regulator for the display brightness, you may have it turn'd down or it has stopped working;. it controls the brightness at which the dash lights are. usually has a speedo sign on it. goes up and down. it works with the main light and is conecter to them on the same lighting board if it has gone then a new light swtch control switch will be needed.

You don't say what the make model and year is, but generally the gauges get power from the same place the gas gauge does. Each gauge is grounded thru a sending unit or switch.
So my guess would be a problem inside the instrument cluster.

The beeping alarm would be for leaving the key in the ignition or the lights on. Maybe a gauge that had dropped to zero.
Let us know if it happens again and what the conditions are.

Do you know that all this stuff was working when it was parked? Lets assume it was. Most of this stuff works with the key on or in the acc. position. You are going to need something to check for voltage. At least a test light better yet, multimeter. The dash lights however, come off the headlight switch. Start by checking for power at the fuse for the gauges it's marked "inst" for instruments it protects all the gauges including the tach and speedo. With the key on you should have power on both sides of the fuse. The antenna won't come up until you get the radio to come on. If you have power at the fuse, Your going to have to start taking the dash apart to see where the "open" in the circuit. If you have no power at the fuse, it comes from the ignition switch, it's down low on the steering column. ( I hope you're skinny)

As for the brakes, since it's been sitting that long I would be pulling the wheels off and looking for a seized caliper.

If your going to do your on work on this car I recommend investing in a good manual, try to find a factory book on ebay. or Craig's list.

This is a way cool car, have fun with it!!!

yes there is a fuse,if that doent sove the problem replace the headlight switch!!!

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check the fuses ,could be a bad dimmer swicht or a blown light

On thedash of my 2003 sedan sebring ,My dash ilumination lights for the speed,temp,tack\rpm and fuel are unlit.
I found that there is a paper thin plastic across and behind all four of these gauges which lights up all four gauges,if working correctly, There is a very poor connection to this thin film lighting system ,basicaly a wire terminal used as a staple and that very well could be your problem.
It as far as I know would require whole gauge assembly replacement! because dealers dont sell such small portions of some assemblies!
I myself will attempt to crimp this poor connection on my car without damaging thin film! there are no bulbs for those four gauges too iluminate!

sounds like your ignition switch going bad