LandRange

I've had problems with the battery loosing power, up to 7-8 amps! Connected the ampmeter between minuscable and minuspole, and I can read about 7-8 amp. I startes to remove fuses, and fuse nummer F57 i the fusebox over the battery, seems to be the one that causes the trouble! In the Haynes book I found that this fuse is for "Micro power control unit" . Now does anyone know what this unit is for? Where is it? What does it do? I Did not have any message on the screen about loosing batterypower!