If your Jeep won't start and you suspect the neutral safety switch, the issue is more likely:
* A faulty neutral safety switch: This needs to be tested or replaced. It's usually located on the transmission itself.
* A problem with the wiring to the neutral safety switch: A broken or corroded wire can prevent the switch from working correctly.
* A problem with the starter solenoid or starter motor: These are common causes of starting issues.
* Low battery voltage: A weak battery can also prevent the engine from cranking.
To diagnose: You'll need to start by checking the obvious — battery voltage and connections. Then, you should have a mechanic or experienced auto-electrician check the neutral safety switch, its wiring, and the starter system. They can test the switch's continuity and voltage to determine if it's the culprit. A multimeter is needed to perform these checks.