I forgot to mention 300E 91, 3 liter engine. 164K miles and was working fine all these years until this December (broken air injection pump 2 weeks ago. The car runs OK with the battery charged but when I turn the ignition no lights are present on dashboard. A series of clicks occur afdter I turn the ignition off: 1 at a small relay in the drivers side relay bo, another next to the battry and a sound that appears to be similar to AC clutch disengagement.BTW the light sequence before shutdown ABS-SRS-death........no battery icon warning......it seems I can rebuild this unit? parts? tks for the repply.