Home >> Ford >> 2014 >> Mustang Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster Illumination And Panel Illumination >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test D: All Dimmable Switch Illumination Is Always On >> Possible Sources