Charging System Operation and Testing (94 Toyota Celica)

Video Description

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. Interested in the tools I use? Check out my lists! https://www.amazon.com/shop/scannerdanner https://www.scannerdanner.com/tools.html 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. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere! Disclaimer: Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.