Here is one I have never had before not can I find anything about it on the web. (I will keep looking) On my short trip to work this morning I noticed the battery light had come on and then when releasing my foot off the accelerator to take a corner I noticed the light went off and then back on when accelerating out the corner again. I got to the car park and with the car idling there is no battery light but under acceleration it pop back on again. I whipped the book out and it says that the light indicated battery discharge. Is this Toyotas way of telling us that the battery is not getting charge i.e. the alternator has a problem or that the batteries are at the end of their life or that they are in fact discharging instead of charging? Any bright ideas welcome and ill check the alternator belt and get the batteries checked at lunch time. EDIT - It would seem I need to check the batteries with the engine off it should give me 12v and with the engine on close to 14v if not then the alternator is on its way out.