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Why does my 1985 dodge truck have no spark?

1. Faulty Ignition Coil:

- Inspect the ignition coil for cracks or damage.

- Use a multimeter to test the primary and secondary resistance of the coil. Replace if faulty.

2. Bad Spark Plug Wires:

-Check for any disconnected, damaged, or corroded spark plug wires.

- Replace any faulty spark plug wires.

3. Distributor Cap and Rotor:

- Inspect the distributor cap and rotor for carbon buildup, cracks, or damage.

- Clean or replace the cap and rotor if necessary.

4. Ignition Module:

- Check the ignition module for any signs of damage or corrosion.

- Test the ignition module according to the manufacturer's specifications. Replace if faulty.

5. Electronic Control Module (ECM):

- The ECM controls the ignition system in your vehicle.

- Check the ECM for any loose connections or damage.

- If there's an issue with the ECM, you might need to replace it.

6. Faulty Crankshaft Position Sensor (CKP):

- The CKP sensor provides the ECM with information about the engine's position and speed.

- A faulty CKP sensor can lead to ignition problems. Test and replace if needed.

7. Bad Battery or Battery Connections:

- Ensure that the battery has sufficient charge and that the battery connections are clean and tight.

- Clean or tighten the connections if necessary.

8. Starter Solenoid:

- The starter solenoid provides power to the ignition system when the key is turned.

- Check the solenoid for any signs of damage or corrosion. Replace if faulty.

*Tip: If you've checked all of these components and still don't have spark, it's best to consult with a professional mechanic for further diagnosis.