Hey graham,
The alternator is located on the right of the engine (when your facing it) you will notice all the belts there and one chunk of metal which looks like this (see link)
If your alternator is already faulty better to change it before it gives you some real problem. A used alternator is not expensive, can still be obtained form some of the chop shops or members in this forum. Battery warning light can be low batt voltage or faulty alternator.
e.g engine bay (alternator is under the timer belt cover)
http://mr2.noegruts.com/engine/engine01.jpg
e.g. alternator
http://www.compact4wd.com/rav4oz/PublicDownloads/andrew/3S-GTE engine/Fitting/alternator.jpg
The alternator is located on the right of the engine (when your facing it) you will notice all the belts there and one chunk of metal which looks like this (see link)
If your alternator is already faulty better to change it before it gives you some real problem. A used alternator is not expensive, can still be obtained form some of the chop shops or members in this forum. Battery warning light can be low batt voltage or faulty alternator.
e.g engine bay (alternator is under the timer belt cover)
http://mr2.noegruts.com/engine/engine01.jpg
e.g. alternator
http://www.compact4wd.com/rav4oz/PublicDownloads/andrew/3S-GTE engine/Fitting/alternator.jpg