On most vehicles today the voltage regulator is built into the alternator. If that is the case then just replace the alternator. If the voltage regulator is external on your vehicle then replace the voltage regulator.
The voltage regulator is not working properly.
Simple, have the alternator checked and if it is okay, check the alternator circuit to the battery
by changing the alternator
what exactly happens to your alternator when you hook up your battery backwards?
To fix an alternator problem, first diagnose the issue by checking the battery, fuses, and wiring connections for any signs of damage or corrosion. If the alternator is faulty, you may need to replace it. Before removal, disconnect the battery to prevent any electrical shorts, then unbolt the alternator and disconnect the wiring harness. Install the new alternator, reconnect everything, and test the charging system to ensure it's functioning correctly.
Most likely the problem is your alternator....the battery light actually does not monitor battery condition, only the charging system. I'd check the voltage regulator and the fuses first. The fuses are the cheapest fix and the voltage regulator will run about 25% less than an alternator.
Bad ECU, replace.
alternator is probably not charging. you need to fix this NOW. new alternator is likely the only repair.
Most likely, your starter isn't the problem. You may have a bad alternator. Usually when your battery doesn't recharge properly it's an issue with the alternator. Have a mechanic inspect the alternator if you're not comfortable doing it yourself. If it is an issue with the alternator, it's a pretty cheap fix.
Defective voltage regulator, which is built into the alternator. Have the alternator tested. Most auto parts store will do this for free.
Yes if the alternator is overcharging the battery.
run it and then disconnect the negative wire from the battery if alternator dies its bad.