1993 Buick Regal Owner's Manual - Page 108

Volts Gage The "VOLTS" gage shows voltage in the electrical system. The normal range is 11 to 15 volts. If the gage reading stays in either red range, have your Buick dealer checkthe electrical system. ., Check Gages Light The "CHECK GAGES" light indicates that there is an engine or electrical problem. If the "TEMP," "OIL" or "VOLTS" gages read properly, there may still be an electrical problem which should be checked by your Buick dealer. CHECK GAGES . VOLTS 106