Q: Engine starts cranking without key when hooking up battery

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Battery died about 2 months ago. when jump started 2 times, started normally. When jump starting 3rd time, engine turns without key in ignition. Then bought new battery and when hooking up, engine still starts cranking without key in ignition. Need to troubleshoot and fix problem. Please advise.

My car has 120000 miles.
My car has an automatic transmission.

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