Here's how to test it:
1. Locate the Neutral Safety Switch: This switch is typically found on the transmission itself, near the linkage connecting the shifter to the transmission. Consult your vehicle's repair manual for the precise location. The manual will also show you the wiring diagram and connector.
2. Disconnect the NSS Connector: Carefully unplug the electrical connector from the neutral safety switch.
3. Identify the Terminals: The connector will have two or more wires. Your repair manual will show which terminals are relevant (usually a power and a ground). Often they're labeled on the switch or connector itself.
4. Use a Multimeter: Set your multimeter to the continuity test setting (usually represented by a diode symbol).
5. Test for Continuity in Neutral:
* With the transmission in Neutral: Touch one multimeter lead to one terminal on the connector and the other lead to the other terminal. If the switch is working correctly, the multimeter should show continuity (a beep or near-zero resistance).
6. Test for Lack of Continuity in Other Gears:
* Shift the transmission through all the gears (Park, Reverse, Drive, etc.): In each gear *other than neutral*, the multimeter *should not* show continuity. If it does, the switch is faulty.
7. Inspect the Wiring: While you have the connector unplugged, visually inspect the wires for any damage, breaks, or corrosion. Repair or replace damaged wiring as needed.
Important Considerations:
* Repair Manual: A repair manual specific to your 2000 Dodge Ram 2500 is highly recommended. It will provide precise locations, wiring diagrams, and specifications. Generic instructions may not be perfectly accurate for your specific model.
* Jump Starting: If you're having starting problems, avoid jump starting the truck while testing. This could damage the NSS or other components.
* Professional Help: If you're uncomfortable working on your vehicle's electrical system, it's best to seek professional help from a qualified mechanic.
Alternative Test (Less Precise):
If you can't readily locate the terminals or aren't comfortable with the multimeter test, you can try a less precise method (but still requiring caution): Try to start the truck while in Park and Neutral. If it starts in Neutral and *not* in Park, it suggests a possible problem with the NSS. However, this doesn't definitively diagnose the NSS; other starting system components could also be at fault.
Remember to reconnect the NSS connector and the negative battery terminal once you're finished testing. If the switch tests faulty, it needs to be replaced. Always replace with a switch specifically designed for your year and model of Dodge Ram 2500.
