* Starter Motor Issues: Even with power reaching it, the starter motor itself could be faulty. This could be due to a:
* Bad starter solenoid: This is the electrically controlled switch within the starter. It might be seized, worn out, or have internal electrical problems. A clicking sound when you turn the key is often a sign of a bad solenoid.
* Worn brushes or bearings in the starter motor: These cause the motor to struggle or fail to turn.
* Gear teeth stripped on the starter or flywheel: This prevents the starter from engaging properly with the engine's flywheel.
* Battery Issues (Despite seeming okay): While you have power *reaching* the components, the battery might not be providing sufficient *cranking amps* to turn the starter motor. A weak battery can appear to have a good voltage reading but struggle under the high current demand of starting. A load test is needed to confirm.
* Poor Connections: Corrosion or loose connections at the battery terminals, starter motor terminals, or any point in the starting circuit can prevent sufficient current from flowing. Inspect all connections for corrosion and tightness.
* Neutral Safety Switch (or similar): This switch prevents the starter from engaging unless the vehicle is in park or neutral (automatic transmission) or neutral (manual transmission). A faulty switch will prevent the starter from working. This is also sometimes called a neutral start switch.
* Ignition Switch Problems: While you say you have power to the coil and starter, a failing ignition switch might not be providing the correct signal or sufficient power to the starter even if power is reaching other parts of the system.
* Other Wiring Issues: A break or short in the wiring between the ignition switch and the starter motor can prevent the starter from receiving the necessary power.
Troubleshooting Steps:
1. Check battery voltage under load: Use a load tester to check the battery's cranking amps. A simple voltage check isn't enough.
2. Inspect all connections: Look for corrosion, loose connections, or broken wires, especially at the battery terminals, starter motor terminals, and the ignition switch.
3. Listen carefully: When you turn the key, do you hear any clicking sounds (often indicates a bad solenoid)? Is there a whirring sound that suggests the starter motor is engaging but not turning the engine?
4. Tap the starter: (Use caution!) Gently tapping the starter with a hammer or wrench *sometimes* helps free a sticking solenoid, but this is a temporary fix at best.
5. Test the starter solenoid: Use a multimeter or a test light to verify power reaching the solenoid.
6. Check the neutral safety switch: Ensure the gear selector is in park (automatic) or neutral (manual), and test the switch for continuity.
If you're not comfortable working on your vehicle's electrical system, it's best to take it to a qualified mechanic for diagnosis and repair. Attempting repairs without proper knowledge can lead to further damage.
