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1992 Cadillac El Dorado does not start due to anti theft system. Any suggestions on 1992 Cadillac Eldorado

(Security) light does not come on. Waited 3 minutes. tried to start car but it won't start. Tried different key, still won't start.

agree with justin
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If I remember correctly the '92 Cadillacs have the resistor pellet in the key. Because you already tried a different key the problem could be a broken wire from the ignition tumbler to the connector under the dash. Have someone test the resistance of the tumbler and replace if needed.