Hi I had this on a 2007 Fiesta once locked the illumination stayed on the speedo It was not flattening the battery but would if you left it a few days with out driving it. They had one at my local breakers yard so I got all the bits and swapped them over one by one Gems Unit/Dash Unit Turned out to be the speedo/dash so copied mileage data and immo data with USB upa wrote to the new speedo and all was good. Hope you have the same luck.