My 94 ES 300's battery light comes on and off and now it has been staying on for a few miles and has triggered the ABS light now. I have an after market stereo with an amp 2 subs but I also have a capasator. This happens even when my seytem is turned off. I replaced the alternator a few months ago. The battery will start every time. I cant figure it out. Help!!!!!!!!!!!!!!!!!!!!!!!!!!

First thing to do would be to put a fluke on the battery terminals with the car running to see if you have around 14.5 volts.

Do this preferrably when the batt light comes on. If you getting 14.5 volts, then the alternator is working.

YOu should have 12.5 without the car running. If you dont, your batt toast.