1. Check the Basics:
* Battery: Make sure the battery is fully charged and has good connections (clean terminals free of corrosion). A weak battery can sometimes prevent a spark. Test the battery voltage with a multimeter.
* Cranking Speed: Is the engine cranking over strongly or slowly? A slow crank might not provide enough power for the ignition system. A bad starter or low battery voltage could be the culprit.
2. Ignition System Components (in order of likelihood):
* Ignition Coil: This is a common failure point. It transforms low voltage battery power into the high voltage needed for a spark. You can visually inspect it for cracks or obvious damage. A multimeter can check the coil's primary and secondary resistance (consult a wiring diagram or repair manual for the correct values). A bad coil needs replacement.
* Ignition Control Module (ICM) / Distributor: The ICM (sometimes integrated into the distributor) controls the firing order of the spark plugs. If it's faulty, no spark will occur. These are harder to test at home without specialized equipment.
* Distributor Cap and Rotor: Inspect for cracks, burns, or corrosion on the cap and rotor. Even minor damage can prevent a spark. A simple visual inspection is usually sufficient.
* Spark Plugs and Wires: Check the spark plug wires for cracks or damage. Inspect the spark plugs for wear or fouling. Try removing a plug, connecting it to the wire, grounding the metal part to the engine block, and cranking the engine. You should see a strong spark jump the gap. If not, the problem lies before the spark plug.
* Cranking Position Sensor (CKP Sensor): This sensor tells the ICM when to fire the spark. A faulty sensor will prevent a spark. Its location varies by engine type, consult your repair manual.
* Ignition Switch: While less common, a faulty ignition switch can prevent power from reaching the ignition system.
3. Testing:
You'll likely need a multimeter to test the ignition coil, ICM, and potentially other components. A repair manual specific to your 1995 Ford Ranger's engine (e.g., 2.3L, 2.9L, 4.0L) is invaluable for providing wiring diagrams, component locations, and resistance values.
4. Professional Help:
If you're uncomfortable working with automotive electrical systems, it's best to take your truck to a qualified mechanic. Improperly diagnosing and repairing electrical problems can lead to further damage.
Important Notes:
* Safety First: Always disconnect the negative battery terminal before working on any electrical components.
* Wiring Diagram: Obtain a wiring diagram for your specific vehicle to trace the path of the ignition circuit.
By systematically checking these components, you should be able to pinpoint the cause of the no-spark condition in your 1995 Ford Ranger. Remember to consult a repair manual for specific procedures and values related to your vehicle.
