1993 Buick LeSabre Owner's Manual - Page 117

Volts Gage OLTS When you turn the key to RUN, this light will come on briefly, to show that your alternator and battery charging systemsareworking. If the light stays on, you need service, and you should take your Buick to the dealer at once. To save your battery until you get there, turn off all accessories, and set your air system to OFF. If you have the optional gage cluster, this 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 check the electrical system. 115