no volts lite !!!

Currently working on a 1995 Olds Regency that will not charge. Customer changed battery and alt. Problem is no power in field wire to alt. Volts lite does not come on when key is turned on or even when car is running. Pulled dash and checked bulb...OK. Checked fuses in both fuse panels and under hood fuses...OK. Checked battery cables and grounds...OK. Anyone have any ideas? Thanks for now.