If the symptom is not present when the vehicle is being checked for a problem, it may be necessary for you to simulate the conditions and environment under which the incident occurred. Proceeding with a diagnosis when the vehicle is not displaying the symptom may lead you to a No Trouble Found Diagnosis. What I will try to do is illustrate ways to simulate the conditions/environments under which you can experience an electrical incident.

There are six common conditions that can cause an intermittent problem:

1. Vehicle Vibration
2. Heat Sensitive
3. Freezing
4. Water Intrusion
5. Electrical Load
6. Cold or Hot Start Up

To properly simulate the condition under which you experience the problem, it is important that you have a thorough understanding of the incident. Take notes of when, where and what happened. This way you can see patterns and have a better understanding of, exactly, what you are looking for and under what conditions.