A diagnostic system for detecting faults in electrical wiring, and manufacturing method thereof is provided. The diagnostic system includes a diagnostic sensor coupled to a data acquisition system. The diagnostic sensor includes a sensor housing with a flexible coil sensor disposed inside. The sensor housing includes a base portion, lid portion, and a joining portion, wherein one end of the lid portion is detachably coupled to a first end of the base portion and another end of the lid portion is coupled to a second end of the base portion via the joining portion. The diagnostic sensor further includes a connector coupled to the flexible coil sensor.