Intermittent failures in electronic systems may be very difficult to detect and accurately diagnose. For this reason, a thorough test drive is often needed in order to repeat a fault condition. If the system malfunction is not repeated during the test drive, a good description of the complaint may be useful in locating an intermittent malfunction. Faulty wires or connections cause most intermitting problems. When an intermitting condition is suspected, inspect the suspected circuits for the following conditions:

Most system complaints are linked to faulty wiring and connectors, and occasionally to a component. Perform a thorough inspection of all related wiring and connectors pertaining to intermittent concerns.