Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Starter Motor
Correct starter motor operation can be confirmed by performing the following free running bench test. This test can only be performed with the starter motor removed from the vehicle. See STARTER MOTOR SPECIFICATIONS for the starter motor specifications.
- Remove the starter motor from the vehicle.
- Mount the starter motor securely in a soft-jaw bench vise. The vise jaws should be clamped on the mounting flange of the starter motor. Never clamp on the starter motor by the field frame.
- Connect a suitable volt-ampere tester and a 12-volt battery to the starter motor in series, and set the ammeter to the 100 ampere scale. See the instructions provided by the manufacturer of the volt-ampere tester being used.
- Install a jumper wire from the solenoid terminal to the solenoid battery terminal. The starter motor should operate. If the starter motor fails to operate, replace the faulty starter motor assembly.
- Adjust the carbon pile load of the tester to obtain the free running test voltage. See STARTER MOTOR SPECIFICATIONS for the starter motor free running test voltage specifications. .
- Note the reading on the ammeter and compare this reading to the free running test maximum amperage draw. See STARTER MOTOR SPECIFICATIONS for the starter motor free running test maximum amperage draw specifications.
- If the ammeter reading exceeds the maximum amperage draw specification, replace the faulty starter motor assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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