Why does the car starter motor run continuously?

21 Oct 2024

The car starter motor may run continuously due to several potential reasons:

1️⃣ Stuck Starter Solenoid Contacts: If the contacts within the starter solenoid get stuck in the engaged position, it can cause the starter motor to continue running even after the engine has started.

2️⃣ Faulty Ignition Switch: A faulty ignition switch may not properly disengage the starter circuit after the engine has started, leading to continuous operation of the starter motor.

3️⃣ Short Circuit: A short circuit in the wiring or electrical system related to the starter motor can bypass the normal controls and keep the motor running continuously.

4️⃣ Stuck Bendix Drive: If the Bendix drive, which engages the starter motor with the engine flywheel, gets stuck in the engaged position, it can cause the motor to run continuously.

5️⃣ Faulty Starter Relay: A malfunctioning starter relay may fail to disengage the starter motor circuit, causing it to run continuously.

6️⃣ Mechanical Failure: Internal mechanical failures within the starter motor itself, such as a damaged armature or worn-out brushes, can also lead to continuous operation.

To address the issue of a car starter motor running continuously, it's essential to diagnose the root cause by inspecting the starter motor, solenoid, ignition switch, wiring, and related components. Depending on the specific cause, solutions may include repairing or replacing faulty components, such as the solenoid or ignition switch, fixing wiring issues, or replacing the starter motor if necessary. It's advisable to seek assistance from a qualified mechanic for a thorough diagnosis and repair.

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