Charging System Operation and Testing (94 Toyota Celica)

Intermittent charging system/battery light comes on while driving problem.This video covers the typical checks that must be done on a non computer controlled charging system before replacing an alternator.
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Video breakdown:
- what you need to do when the battery light comes on :20
- battery and charging system fundamental checks 1:12
- idle voltage with no accessory loads 2:02
- battery/charging light test 2:27
- load circuit voltage drop test of the alternator main cable and ground 3:07
- accessory drive belt check 6:23
- battery terminals and wiggle testing 7:49
- alternator noise/whining 10:04
- why it is so important to fully charge a battery before installing a new alternator 11:45
- alternator stops charging, battery light comes on 12:42
- wiring tests during the no charge condition 14:00
- tap test on the alternator restored charging 18:34
- charging system wiring diagram 19:14
- alternator replacement 22:30
- what is a surface charge and how do you get rid of it 26:03
- first start with new alternator and it is still not charging 28:00
- retest of the system after an overnight trickle charge of the battery 34:40
- loaded circuit retest of the charging system (alternator output test) 36:21
- open circuit testing mistakes made earlier in the video and why it is so important to do loaded circuit voltage tests 38:08
- Voltage Testing Fundamentals video (loaded circuit testing and why ohmmeters suck) https://www.youtube.com/watch?v=w0PpLTnKKZg 43:39
- Toyota Echo with a bad computer ground (again, the ohmmeter missed it but loaded circuit voltage drop testing found it)
https://www.youtube.com/watch?v=44dP6X3QS5A 43:39
- Bad fuel pump ground (low power with tail-lights on!) voltage drop testing was key once again https://www.youtube.com/watch?v=rQ7tvIxQSt0 43:39
- Outtakes 45:23

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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Видео Charging System Operation and Testing (94 Toyota Celica) канала ScannerDanner