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By taking it off and testing it for resistance with a digital multimeter.

All the neutral safety switch does is ensure the vehicle will not crank with the key in any other gear position than neutral or park. If you need to start the vehicle before figuring this out, ensure the vehicle is in park (you should also put the parking brake on). Turn your wheels all the way to the left, and put your key in the ON/ACC position. Look under the hood, and you should see where the starter is (in front of the flywheel, typically on the right side of the vehicle). You'll see some posts coming out of the starter with wires attached to them. Use a cable - such as a starter cable or test lead - to apply power to the small post. Be careful to ensure that the cable, your clothing, or any of your body parts are clear of all moving objects before doing this. You can start the vehicle this way, and it will run so long as the key remains in the on position.

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10y ago
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18y ago

A misaligned or defective neutral safety switch will cause you to have to wiggle the gear selector in order to get the engine to start. You may even have to put it in Neutral. The switch is there to prevent the engine from starting while in gear. It should only start in Park or Neutral.

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17y ago

back up lights not working, no crank problem. Your car won't start (or even try to turn over).

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Q: What happens when the neutral safety switch fails?
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