I HAVE A LEXUS GS300 1993, TODAY MY BATTERY LIGHT CAME ON AND MY CAR WOULD NOT START. I HAVE BEEN HAVING TO JUMP MY CAR OFF SO I BOUGHT A NEW BATTERY AND PUT IN IN. BUT BEFOR I DID, ON MY WAY TO WORK THE LIGHT STAYED ON AND THINGS KEPT FLASHING OFF AND ON. WHEN I SLOWED DOWN TO MAKE A TURN MY CAR DIED. THATS WHEN I REPLACED MY BATTERY BUT MY BATTERY LIGHT IS STILL ON AND THERE IS A SQUEAKING NOISE COMMING FROM MY ENGINE. I WORK LATE AND I AM NOT SURE IF I WILL MAKE IT HOME. CAN YOU TELL ME WHAT THE PROBLEM COULD BE?
Sounds like the alternator has kciked the bucket. The light means the computer has sensed that the alternator is not putting out 14 or so volts. Shitgun diagnosis, but you won't have a vat machine to test the charging system.