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Starter test through Adding 12 Volts to the S Terminal Circuit

Starter test through Adding 12 Volts to the S Terminal Circuit

Now we're gonna' apply the 12 Volts ourselves (with a jumper wire or a tool like a Power Probe) to verify that the starter motor works.

We're gonna' get only one result from this test. And it's that the starter motor should engage the engine and crank it.

1. Step 1:
  • With the vehicle still raised and supported on jack stands.
  • And the starter motor connected to all of its cables/wires.
2. Step 2:
  • The Key (Ignition Switch) must be in the Off position (or the car or truck may start).
3. Step 3:
  • Apply 12 Volts (with a jumper wire or a suitable tool or tools) to the starter Solenoid's S Terminal or to the wire itself.

The starter motor should engage the engine and crank it. If it does, then now you can be absolutely certain that the starter motor is good and not the cause of the Does Not Crank Condition. The most likely causes will be a BAD Ignition Switch or a BAD Neutral Safety Switch.

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