Car keeps flatening batterry light and indorcators wont work either

Do a voltage drop test on the battery cables.

Replace or check alternator or battery

Look in the fuse box and there should be a diagram showing which fuse it is. If that doesn't work, take it to a mechanic and they can do it for you.

The fact that you have disconnected the battery for a month without any form of charghing is risky, as batterries that have been used for a long time and then suddenly disconnected go flat quickly especially in winter or cold months. Have you checked your batterie's voltage to see if it is not flat? Do so if not.The little bit of current left in the batterry will be enough to switch on the CD player's lights as these are merely LED's which only need about 1 to 1.5 volts to work and this is why everything else that uses larger voltages does not work.

wire shorted to ground

change or charge the battery and make sure you install the correct alternator capable of supplying the correct amps your car needs otherwise it wont charge correctly/ check your electrical wiring it must be grounded somewhere or the connection is incorrect thats why ur battery drains...

Temperature or coolant level low indicator.

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If all else is working ok, it may just be the fuse supplying the lights. If you confirm it is getting power, then it is possible there is a faulty chip within the binnacle (gauge unit) These can be repaired by specialists in this repair fairly cheaply.

check your relays