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Engine "Cranks" When Battery is ConnectedAnswer 1Defective ignition switch. Answer 2 - Another OpinionAlthough answer 1 is possible, over many years I've seen this incident occur several times, and after troubleshooting the circuit, the cause was determined to be that the "starter solenoid" [a relay switch] was "stuck" in the "closed"/ON position.

If the starter solenoid is the cause, then replacing the solenoid will cure the problem, and a starter solenoid is a whole lot less expensive and easier to replace than an ignition switch!!!!!

One way to "test" this theory is to temporarily remove the wire from the ignition switch to the starter solenoid. This wire is small in diameter, and usually connects by a "friction" type end terminal connector over a small threaded terminal [the terminal looks like a small screw sticking out off the side of the solenoid].

On some brands of vehicles, instead of the friction connector, the wire may be secured to the solenoid with a NUT on the small, threaded screw terminal.

To remove a friction type connector, just grasp the connector between the thumb and forefinger, and gently twist and pull. Where a nut is used to secure the ignition switch wire to the solenoid, a small wrench will be required.

After removal of the wire, touch the battery cable connector to its battery terminal.

Then, IF the starter cranks, the problem is that starter solenoid is defective and needs to be replaced. However, IFthe starter does NOT crank, then that suggests one of two possibilities:

  • The wire from the ignition switch has become "shorted" to ground somewhere between the ignition switch and the solenoid, and the short needs to be repaired, or...
  • The ignition switch has become defective and needs to be replaced.
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Q: Engine tries starting on its own when battery hooked up?
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