In this video I cover how to locate an intermittent short to ground that is causing a fuse to blow, which in turn is causing the alternator to not charge. This is part 2 of my Mazda Miata alternator video.

Engine Performance Diagnostics chapter 1

Symptoms
dead battery
inoperative dash lights/gauges
stall
engine won’t crank

Fix
replace the blown fuse, repair the downstream O2 sensor heater wiring

Tests shown
how to read and interpret Mitchell wiring diagrams
how to use Power Distribution and other diagrams to short cut diagnostics
finding the most likely point of failure, keeping ‘heat and vibration’ in mind
how to visually inspect wiring, avoiding tugging on harnesses

Tools used
Pocket screwdriver

Playlist
Starting, Charging and Battery system problems
   • Starting, Charging and Battery system...  

Related videos
How to test an Alternator (alternator not charging from a blown fuse) Mazda
   • How to test an Alternator (not chargi...  
How to check the 5v reference circuit for a short to ground (Cadillac)
   • How to check the 5v reference circuit...  
How to troubleshoot a no crank problem (94 Toyota Celica)
   • How to troubleshoot a no crank proble...  
Bad Alternator Diode causing transmission/speedometer problems
   • Bad Alternator Diode causing transmis...  
Battery keeps going dead (what to test before replacing)
   • Battery keeps going dead (what to tes...  

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/joinsc... 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 online 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.