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Most likely the solenoid or wiring depending on the vehicle. A starter needs 2 things to operate. A current to close the circuit in the solenoid (small wire/trigger wire) and a power source to turn the starter itself (large battery cable). Battery cable goes directly to the starter from the positive battery terminal with an on/off switch in between (solenoid). The trigger wire (small wire) controls the solenoid by closing the circuit when there is power supplied to the small wire. If there is no power at the small wire then the solenoid must be stuck in the closed position unless the large battery cables to the solenoid are connected incorrectly.

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Q: What would cause a starter to keep engaging by itself?
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