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Yes it sounds like the alternator voltage regulator is wearing down and needs to be changed or replaced.
If you can get your hands on a 12 volt multimeter, turn the setting to 20 dc and place the negative wire on the negative battery post and the positive wire on the positive battery post.
The battery with motor off should be 12.6 volts and higher, start the the car the read out should be 14.,2 or higher.
You can turn the lights and heater on to see if the alternator can cope with the load.
if read out is less then you need to change or replace it.
Does the alternator light come on before you start the vehicle.. If not the alternater is incorrectly connected or the globe is blown . It will not charge if the globe is faulty.
sounds like you are due for a new battery .. if you can get it started then take it to an auto parts store .. many will test your battery and alternator for you free ... then you can buy whatever you need from them .. sometimes they eill even change the battery for you .. .. batteries last about 5 to 10 years .. so if yours is original then its well beyond end of life .. the battery terminals need to be cleaned and the alternator checked when installing a new battery ...
sounds like you poped the main fuse in the under hood fuse panel. before that the battery light on in a toyota pretty much points to an alternator problem.
Steve I had similar problem not too long ago about a week to be precise. Your alternator is beginning to go bad. You might service or better still replace it.
Could be the new battery is dead, from something in the vehicle draining it.charge up the battery and see what happens.Also could be the alternator is not charging the battery while vehicle is running.
SOUND LIKE IT MIGHT BE DODGY ALTERNATOR YOU CAN BUY A ALTERNATOR TESTER FROM HALFORD. AND CHECK ALL CONNETION FOR WERE PARTICALLY THE BATTERY CONNECTION
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