* The Ignition Switch: This is the primary control. Turning the key engages the starter circuit.
* The Neutral Safety Switch (NSS): Prevents the starter from engaging unless the transmission is in Park or Neutral.
* The Starter Relay (or Solenoid): This is often integrated into the starter motor itself on a Ford Ranger of that year. It's a heavy-duty relay that receives power from the battery and uses the low-current signal from the ignition switch to close a high-current circuit to the starter motor.
* Fuses and Circuit Breakers: Protect the wiring and components from overcurrent.
To find the potential problem: If you're having starting issues, you should focus on testing these components, rather than looking for a specific "interrupt relay." A mechanic would diagnose the issue by checking the voltage at each point in the starting circuit. This typically involves:
1. Checking the battery and cables: Ensure the battery has a sufficient charge and the terminals are clean and tight.
2. Testing the neutral safety switch: Verify it's working correctly.
3. Testing the ignition switch: Ensure it's sending the correct signal.
4. Testing the starter relay (solenoid): This is usually integrated into the starter motor on the Ranger; a multimeter would be used to check for continuity and proper activation.
5. Inspecting the starter motor itself: Look for internal issues.
In short: There's no separate starter interrupt relay to locate. The problem lies within one of the other components described above. You'll need to consult a wiring diagram for a 2000 Ford Ranger or take it to a mechanic for proper diagnosis and repair.
