01-06-2019, 05:35 AM
Nice work! Glad to hear it's fixed! Now you have a good understanding how the ALT warning light operates.
After all of the back and forth, I suspected the STA voltage coming out of the alternator was too low or non existent. Although, I will admit, I haven't seen that issue before when the alternator still charges correctly.
If you can, also check the diodes when you have the alternator opened up. Just to be certain all the internal components are okay. With one or two bad diodes an alternator will still charge okay but not to its potential. However, if two or more are bad, t will drain the battery when the engine is not running. If you couldn't check them, if there is no drain on the battery, they are probably okay.
After all of the back and forth, I suspected the STA voltage coming out of the alternator was too low or non existent. Although, I will admit, I haven't seen that issue before when the alternator still charges correctly.
If you can, also check the diodes when you have the alternator opened up. Just to be certain all the internal components are okay. With one or two bad diodes an alternator will still charge okay but not to its potential. However, if two or more are bad, t will drain the battery when the engine is not running. If you couldn't check them, if there is no drain on the battery, they are probably okay.
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