How to find a short to ground (blown fuse)
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- Опубликовано: 12 июн 2024
- 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...
Related videos
- How to test an Alternator (alternator not charging from a blown fuse) - Mazda
• How to test an Alterna...
- How to check the 5v reference circuit for a short to ground (Cadillac)
• How to check the 5v re...
- How to troubleshoot a no crank problem (94 Toyota Celica)
• How to troubleshoot a ...
- Bad Alternator Diode causing transmission/speedometer problems
• Bad Alternator Diode c...
- Battery keeps going dead (what to test before replacing)
• Battery keeps going de...
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 www.scannerdanner.com/join-sc... 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. 
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Please someone help me I cant stop watching these video ! Its been weeks I'm hungry I need a shower
Lol
+Daniel Lelievre Seeker of knowledge. Let nothing stop your quest. This stuff is absolute solid gold. Voted UP!
I would help you but I have to get to my shrink. We are working on a serious case of 'scope envy'! Then I have to finish the SD videos but as soon as that is done I will be on my way! Doug
Bought a used Solus Pro and Vantage Pro and its a lot of fun finding troubles on cars. Last week I found a faulty IPR valve on a Ford diesel. Solus showed the pressure of the oil being not regulated and at the same time the Vantage showed the IPR being feeded the required voltage AND with the Amp clamp I could see the wattage over time. No more guess work.
Daniel Lelievre Sounds sweet. Not much of a used market in Alaska. I might have to research the $200 and less models.
One thing I like using when it comes to a fuse popping issue is to pull the fuse out and run your test light inline in replacement of your fuse. If it's a short to ground the test light will light when the wire is grounded. This won't work with every situation but it helps keep ya from going through handfuls of fuses during diagnostic.
I tried this and blew my tester lol
That doesn't quite make sense. If you place your light, inline in place of the fuse, you would just be completing the circuit, of course it would light.
My car cranks by nagavte post when switch is not on
Nice
anytime i get a youngish male bringing in a problem I tell them to make a list of all their DIY work. it has proven to be a real time saver.
I try to ask as much as possible. Always an issue with work done in the past when not done properly lol; a lot of times though, the owner just bought the car and have no history of it lol. Same goes with buying broken cars and reselling them, unless the owner is the one selling it, then you can squeeze as much info as possible prior to making the purchase and get an idea on what you are about to get your hands on.
Lol.... I would say what was the last thing that changed???
Give them credit for at least trying
Just seeing wires directly against metal edge like that is enough for me
Sometimes when I’m watching your videos I start smiling because I ask myself....How good is this guy? Sheer brilliance.
Its called "doing the job the right way."😊
GOD WORKS IN HIS OWN WAYS ,SENDS HIS PROPHETS IN TIMES OF NEED .THANK YOU SCANNER D. YOU HAVE FIXED MORE THEN AN ELECTRICAL , BUT ALSO A SPIRITUAL , AN UNCOMMON MAN SHARING SECRETS FREELY. WOW ,AMAZING .THANK YOU FOR THE CUP OF WATER TO THIS THIRSTY MAN. 🥇
God is good my friend. always! even when times are bad
@@ScannerDanner AGAIN, thank you ,GOD IS GOOD.
Praise be to God ❤️🙏
I'm not very optimistic when it comes to mechanics. I think most would have put in a new fuse and sent you down the road. I have to say you really showed a lot of knowledge and skill to track down this short. Kudos to you Dan and thanks for sharing your knowledge with us.
What do you call INTELLECTUAL AND PRODIGY and SUBSTANTIAL add one more KNOWLEDGEABLE the answer is
ScannerDanner
My teacher
Sir ScannerDanner
Thank you very much helpful video loved it From the start to finish tutorial 👌 👍
Take care and have a great day
Sir ScannerDanner
My teacher
From Nick Ayivor from London England UK 🇬🇧
At 8.08 Scannerdanner said "Hopefully we can find this problem". I just smile, was he just being funny. He always find the problem. I love his videos. He never gives up.
Butt connectors not shrunk, chafing wires, bad harness tie up, "universal" parts...Just goes to show that when someone chooses the "cheap" path, they get what they pay for. Whenever I find crap "repairs" like that O2 sensor are the cause of a problem, a string of expletives usually flows from my mouth followed by a feeling of satisfaction that the problem has been found. I enjoyed the video. Even as a salty, old wrench turner I learned something new.
Paul. These videos are great! From the first video to the end of this one there is a lot of info that can be used in so many situations. Thanks!
Paul, your diagnostic videos are pure poetry!
Good video. I like your tip on carefully following the harness and pushing on it without moving it to find the short.
Great video, especially the wiring diagrams, cinematography and the beat up pocket screwdriver. That screwdriver tells it all
It's amazing the genius it took to design such an amazing circuit powering the alternator.
I agree with Daniel, can't believe how much I'm learning, and have been doing it most of my life. Today, you have to know electronics better, or your out of the game !
Watching your videos is like apprenticing for a great drivability tech.
I truly appreciate and enjoy your videos and I hope you have a great time with doing them. I can see that the majority of the time you enjoy the challenge and I say that you do it very well
Boy, that takes the intimidation out of an impossible search ! Thanks
Great video, I'm new to all this and I learned so much from this video compared to others I've watched. Going to keep learning before I jump in and try n find what's wrong with my car
Awesome men awesome! You are truly inspiring and a blessing. May God bless you abundantly in all areas as you provide us with knowledge and DIY fixes. Thanks brother.
Great follow through with the original problem, Paul!
The reward of discovering the root cause makes it all worthwhile, eh 👍🏼👏🏼
Absolutely
I have watched these two videos a few times. They r not new. But this case study is invaluable. This is Paul at his best!! And yes I have Scanner Danner Premium. Way better than C.S.I
Thanks Bill!
That was a really cool case study. I watched both parts and was amazed by your knowledge. Thank you for sharing it with us.
Great video. Wiring issues can be so time consuming and difficult to identify. Terrific job of explaining your techniques and the important tips, look at the diagram first, look at the potential problem carefully first, look at the OEM installation carefully before making a repair and repair it back to how it was. Good job, thanks!
Improper O2 sensor replacement/aftermarket junk leads to alternator not charging. Brilliant my friend. Today you have taught me the value of not rushing to wiggle test, and also that alternator lights can trigger the alternator to turn on. I thought they were all either PCM controlled or completely standalone.
Amazing that there are so many circuits on this one fuse.
I really appreciate your work and dedication. Thank you for all the details.
A great video as always Paul, thanks. I can't believe anyone (let alone anyone in the trade) would do a repair like that, I would NEVER run bare wires through open holes...manufacturers don't put stuff in for the heck of it. I do this stuff as a hobby and learnt a long time ago that you're asking for trouble using electrical tape not heatshrink or twisting wires together instead of soldering. Your diagnostic skills are awesome, an automotive Sherlock Holmes!
Have you not ripped apart a OEM harness? 80’s-90’s engineers commonly used electrical tape and commonly used copper clamps and literally triple wrapped wires together in a main harness with a copper holder that are known to corrode 1 wire to 2-4 wires lol it’s OEM engineer harness work I see this in a lot and replace this on a lot.
I had an issue with the charging system of my 2006 Automatic Mazda Premacy.
Not too familiar with reading wiring diagrams but this video taught me something to look for. I will do a manual check on the alternator regulator and the grounding harness.
Great video .your very sharp. I will be buying your book. Thanks for all the video's . I've learned alot from your troubleshooting skills.
Great point why gourmets are purposely placed where they are! Love the best explaining learning guidance!
Watching this video paid off big time for me last week! Had a Honda popping the PGM-FI main relay fuse, power distribution diagram says it feeds about ten circuits, one of which is a heated O2...
The logic of 'check the wires that are most likely to be damaged first' was perfect. Found the short in minutes, instead of hours.
Sweet! Thanks for being part of this with me.
great videos, Mr Paul, and thank you for sharing with us your knowledge. take care and blessings. greetings from Mexico
Very KNOWLEDGEABLE
Sir ScannerDanner
Thanks 👍
From Nick Ayivor from London England UK 🇬🇧
Thank you Paul danner I'm learning more in Auto Electrical troubleshooting with your videos
Great to hear!
@@ScannerDanner I'm in second Year but people are shocked by the way I'm troubleshooting Electrical Faults which are failed by More Technician
Great tips, and I really appreciate the extra info on Mitchell's diagrams. We have Mitchell's, the vantage, the vantage pro, and the verus at work, so pretty similar setup to what you use. I've never taken the time to fully read thru the "using mitchell's diagrams" tab. I will now that you've shown that there is good information to be learned there. Thanks.
Thank you!
@@ScannerDannerno no no. Thank YOU!😊
What a valuable video Mr. Danner. Thank you for this submission.
Thank you for the video. Always very informative. Makes me want to be a better mechanic/ technician.
Once Paul another scintillating video!
Ty scanner Danner this will help my track down the problematic short!! God willing of course.
another great vid mr danner, im totaly with you.
i do not like to fit the non standard o2 sensors for that reason.
Another gem watched !! fantastic tips in these video's.
Awesome, awesome troubleshooting video. That was very well done!
Great video..The joys of fixing other peoples mistakes..
Fixed a fuse that would pop instantly, thank you so much
That was an awesome find
Thanks for showing this!
Appreciate the info! You deserve more views son! 🤟
heat,vibration , AND corrosion great video get more indepth with the wiring diagrams
This video was a lot of help! Thank you!
Who is this guy ... the 12v whisper... Dan , agin you are the man
thank you my friend. i think it comes from field work. i feel like it is a necessary part of it. you can't just talk about it, you have to apply it too. show people when and how to use their diagnostic "tool box"
Yet another awesome video Paul. Thanks
Thanks Scannerdanner. Awesome learning TOOL. Australian boy. Bob. Thank you very very extremely much. God's. Love to you and yours.
Excellent video Danner
Thank you so much for a useful video lesson!!!
Paul Good VIDEOS . i too get many issues with cars it's also my job Reckymech 15 years now nice to see someone helping the people who do not get electrics or modern can bus . i can not fault your work sir good job. Ironic that this fuse box was so empty yet they load six different resources all on that one position kind of skank in a way but i can see why they have done so. ;) .
Another Excellent video.
Thank you!
Very good video Paul.
good video and thought process
Nice....real nice thanks for all the hard work into this lesson.. very clear Thank You
thank you!
Hi paul, very intructional video, thank you very much!!!!!
Great diagnostic skills
Great demonstration.
Great series of videos Thanks!
Good stuff!! Just found you and just learned something valuable!!
Welcome aboard!
Great job - thanks for the tip.
Thanks so much for valuable video
Great vid as usual
great work terrific video.
Awesome information. Scanner is the man'ner
thanks so much!
To say that was a great video would be an understatement! Great detail, thorough explanations. You the man! Do you offer online training? I wish I knew of you when I lived and worked back there in West Mifflin and Duquesne. Keep up the great work and thank you for sharing the knowledge and the "Right" way to troubleshoot and "Fix" the problems and not be a "Parts Changer" (pet peeve of mine).
Gregg
im hooked too excellent videos i need to go to bed but one more video! lol
Only 750 more to go ;-)
Thank you!
Awesome video. Thanks.
Great technique.
Awesome video!
Nice video Paul keep it up my friend
Thanks for the tip. Doug
Keep up the good work
Thanks for video... great info..
Great Video!
Nice find!
Great video thanks alot
Wow, a universal O2... you're just asking for trouble, intermittent shorts aside.
Also, the list of stuff on that fuse is daunting, but your method of prioritizing checks based on likely failures is brilliant. Good stuff!
Man you are awesome teacher
I appreciate that!
AWESOME VIDEO!!!!!!!!!!!!!!!
ScannerDanner...Man you teach me so damn much! Thank you!!! 😉👍🏻😃👏🏻 I’m currently having a hell of a time trying to find help as to why I’m having issues with a 2004 Nissan Xterra 3.3l (VG33E) 4WD... Evap canister vent control valve pigtail is only getting 2 volts and dropping. Nowhere can I find help with this and me & electrical are NOT friends. 😞
When I can afford it... I am so buying your book!
great point! didn't even think about that
Darn good video. Thanks brother.
Thanks man!
Prioritizing variables. This is definitely key to efficient diagnosis. The students at Paul's school are lucky. I would say the biggest problem techs have is proper diagnosis. This case study though can throw you off, because since this car is a convertible, interior components can also be causing intermittent issues due to water leaks. Still I probably would have gone O2 first...
I will purchase your book once I'm prepare to go out on the field! #don'tbeapartschanger!
so educational love it
Thanks Grant
Great vid thx.
Thanks RJ
Here from ETCG. Nice vids
awesome! Tell Eric I said hello
what wiring diagrams were you using? available online? I have an intermittent blown fuse Chrysler Concorde. The climate control panel goes off but on the same circuit the ABS and Brake warning light on dash goes off same time when blown.
Thank you
Thanks a lot
Well done