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)    • Multimeter basics, voltage and resist...   43:39
Toyota Echo with a bad computer ground (again, the ohmmeter missed it but loaded circuit voltage drop testing found it)
   • Poor running, flashing CEL, no codes ...   43:39
Bad fuel pump ground (low power with tail-lights on!) voltage drop testing was key once again    • Low Fuel Pressure from a bad fuel pum...   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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