Chrysler Repair: Car wont start in humid/rain conditions, spark plug wires, spark plug wire

Question
I have an older car that runs great. I keep the car outside at night.  Theres' nothing wrong with it, besides the fact that it will not start when it rains.  Everytime the car gets wet, it will not start. What is causing it not to start?  Thank you much for your help !!!

Answer
Hi Tito,
Usually the cause of a no start in rain/high humidity conditions is that the spark voltage is arcing to the engine metal rather that to the spark plug because of worn out spark plug wire insulation. You may be able to observe this when the engine is running at night in a dark location when it is wet outside by opening the hood and observing for arcs jumping out from the spark plug wires. The distributor cap could also be cracked which can also short the voltage to ground. So my first suggestion is to replace the spark plug wires and look carefully at the distributor cap for any signs of a crack.
Roland