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Alternator issue with battery light stays on
I have a 2010 Toyota Rav4 with over 120,000 Km done.
About a week ago I heard some whining sound from my engine, and three days ago the battery light stays on, my current battery is about 13 months old, so went to the nearby workshop, the Mechanic checked the battery and told me that the battery is fine, and asked me to go to an Auto Electrician to check the Alternator.
The Electic Machanic found out the fault in the alternator itself, and he replaced it with a used working alternator, then the better charging started to work fine, but still the battery light stays on. Then the Machanic tried all possible ways and count not solve it.
Finally, he put a cable between the Alternator's generator connector and to a bolt of the Alternator, I believe it is a grounding cable to stop the battery light stays on. I believe this is not the solution, but he did a workaround to stop the battery light stays on.
Today, in order to check, I pulled out the Alternator's generator connector to see if the battery light come on, but it is not. Meaning with this workaround that he did next time if the alternator is fault the battery light come on, which worries me.
What do you all suggest to permanently solve this issue?