1992 Oldsmobile Cutlass Supreme battery keeps dying

my battery keep going dead and nothing on

The BEST Way TO Perform a Parasitic Draw Test - YouTube

Have the battery and charging system tested. If there’s no problem there, test for a parasitic draw.

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While a lengthy read, this could prove useful (it was a defective ignition switch, hard to detect):
Stumped To This Point - Maintenance/Repairs - Car Talk Community