Voltage drop testing a parking light/turn signal circuit

2008 Dodge Charger left front Parking Light/Turn Signals not working. In this video I will show you how to properly test for a voltage drop using just an incandescent test light. We will also be repairing the circuit and reviewing a diagram to explain the back-feed condition the car was having.
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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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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.

[@ScannerDanner]

Don't forget about the Teespring merchandise teespring.com/stores/scannerdanner-2 Proceeds for the month of October will be split between a student scholarship fund at Rosedale Tech and my missionary friend Jon Fowler in Panama (some of you would remember the video I did with him years ago). Thanks so much everyone! You are helping me make a difference.

[@aleskyfinis1025]

Alesky finis

[@paulfiebke3909]

Keep up the good work and God bless you and your family and thankyou for all your hard work

[@juancenicerod5043]

Thank you guys for helping me to fix my 2006 hummer h3, I had change 2 ignition coil clean the throttle sensor n throttle it self n didn't work. Still was misfiring until I saw your video n change the relay n work fine. Thank you again n God bless you all

[@shawnkeenan2156]

you all probably dont care at all but does anyone know of a tool to get back into an instagram account?? I was dumb forgot the login password. I love any assistance you can offer me.

[@krewdaniel1161]

@Shawn Keenan instablaster :)

[@Watchyn_Yarwood]

Reminds me of many years ago while I was managing the maintenance of a fleet of 18 wheelers, we had a Kenworth truck with crazy light problems. The mechanics tried everything, well almost everything, even installing a new ECM! Nothing helped. One of the guys was telling me about it over coffee and I decided to take a look. Purely by chance, I took the tail light lens off, pulled out the 1157 bulb, held it up to the light and the brake/turn filament had burned into on the end, dropped down and was contacting and welded itself to the tail/park filament. The turn signal was back feeding to the entire park light circuit. All because of a $1.50 bulb. Some of this stuff can drive you crazy and sometimes you just need a fresh set of eyes to look at a problem.

[@GlycerinZ]

And also to keep it simple! When I was having taillight issues on my Subaru, the first thing I did was check the bulbs. Burned out, replaced with new ones, problem solved.

[@SmittySmithsonite]

I had that exact same problem once on a car. I was going through wiring for hours looking for a dead short ... and it was in the damn bulb the entire time, lol! Live and learn!

[@roadkill5333]

Proof positive that had you paid those techs a livable wage, they would have replace that bulb, instead of the computer!! [sarcasm] [shakin ma head] [makin three trips to the fast food drivethru, to get my order correct]

[@Watchyn_Yarwood]

@@roadkill5333 You might have a point there (I still shake my head) if it had occurred in the last 10-12 years but that was over 25 years ago and you took what you could get. My KW dealer at the time could not find qualified technicians at any wage! They had to shut down a whole shift due to technician shortage. We were fortunate to have two local guys who could and, most importantly, would work. I've twisted wrenches all my life and never got rich doing it. Yeah, and your three trips thru the drive through enforces the current state of today's workforce. Jump over to western truck and tractor repair's channel and listen to some of his stories about tractor dealer(stealer)ships! He's also a big ScannerDanner fan.

[@roadkill5333]

I'm already a Warren fan, too! About 25 years ago, THE MAN was holding me back, too!! As a matter of fact, I can blame THE MAN for not letting me go to college to learn how to make the same money as rich people. Some silly nonsense about dropping out of high school with a POINT FOUR O grade point average!! I was forced to work for minimum wage, at the skill level that I had, instead of making the same money that wealthy people made!! I once overheard a fast food worker complaint about the horrible working conditions, and the below average pay that she got, while leaning against a counter waiting for my order to be handed to her, so she could hand it to me, without ever looking into the bag, or stop leaning against the counter while she passed the bag with the WRONG ITEMS FOR MY ORDER, out the window!! When I handed it back to her, she had the nerve to ask me what was wrong with the order!! I told her that it was likely all complete and correct!! She asked why I was handing it back. I told her that it wasn't my order. After comparing sacks full of stuff, she handed me my order!! No "I'm sorry", no "have a good evening", it was "here it is"! As I stopped, went thru the bag, and verified the order, she asked if it was all there!! I asked if she was supposed to do that! She asked "do what"? I said verify the order, or let the customer verify whether they got what they already paid for! She just looked at me with a F you look. I wished her good luck on her quest for a raise, and drove off!! When I got home with my cold order, that was undercooked, packed into the bag like concrete blocks not food items, and haphazardly prepared without any sights on quality, I informed corporate to really consider her requests for more money!! I worked at a convenience store, that wouldn't pay much, couldn't keep employees, and when you did something to help ease the cost of losses to the unit, they would hold you accountable! I once caught a shoplifter, that I knew was a shoplifter, I just couldn't prove what he was doing!! I finally caught him, recovered the merchandise, and sent him on his way, WITHOUT CALLING THE COPS!! I was admonished for disrupting business, and falsely accusing a customer of theft, without a police report! (I followed him outside, removed about five items that he hadn't paid for, and used the "you forgot your receipt" for $2 worth of merchandise, to get out there, and NOTICE THE STUFF IN HIS POCKETS!)I also had a gas drive off caught, because several cops were positioned close by, and noticed the commotion, and went and got the guy!! They got their $20 in gas back, I went to court on my own time, and he was not even talked to sternly by the judge, and the mgr refused to ban him from coming back!! We were admonished for having drive offs, and had to attend classes on drive off prevention, theft prevention, and the video tapes were constantly reviewed to see that we were paying attention!! There was no video of customers, in any areas of the store!! I even almost experienced a robbery once, and a restaurant down the street ended up getting it, about 15 mins later. They pulled the tapes to get the descriptions, and pictures, the cameras weren't trained on the customers, only the employees, in non customer areas!! I quit that job, when they wanted to run the store on 24hrs with me and a manager! We lost four employees in a month, and the store refused to back off on the 24hr times!! It was hard enough with three people. But I quit when they wouldn't stop 24hr service with just two of us!! 10hrs a day, for two weeks straight, 7days a week, and they wanted me to run more than 12-13 for God only knows how much longer! 24hrs wasn't worth the time. Barely any sales after BEER THIRTY! On the other hand, I had a lawyer, handling my disability case, call me a year and a half after I employed them, to talk to me for the first time 26 days before my court hearings, to inform me that I had no case because my medical records didn't exist, and I had no proof!! He explained that he was taking a separate course of action (which is exactly what I had been ready for, and had already supplied all of the pertinent information for, which was originally denied) from what I was expecting!! The following week, after I called the dr to get my records, went and picked up the records, took them home and made copies of them, and then took them to the lawyers office, myself, where they promptly refused to accept my medical records because they didn't need them for the case for which they had prepared, which was because they didn't have my medical records to prove my case!! Of course, when it came time to get paid, they wanted all of the premium price for all of the generic work, while they promoted their excellent work records on tv commercials!! I didn't get paid as much, but they got their money, and for almost no work!! My point is you get what they want you to pay for, but what they want to give you in return!! And while giving substandard service, at a premium price, complaining that they don't get enough for what they do! That's true with fry guys, auto techs, store clerk, and attorneys, alike!! And they all claim it's because they don't make enough money afterwards, but offer you the moon beforehand!!

[@romangolovko8306]

Amazing. First time i encountered case like this on my sister Mercedes. I spend couple hours on that, couldn't wrap my mind around it. One Head Light didn't work and hight beems was dimmed. I found problem accidentally, was bad ground inside the plug. Bad connection on pin. Second time soon after i encountered same case on my neighbor car. lights were dim and i knew exactly what was then. It happened 2 years after i singed up with Paul. So my point is for new guys here. Keep on trying. I often do stuff like this for free especially for friends and family just to get the experience. I also going through Pauls classes again. And its pretty amazing how much more you learn going through classes with few years of experience. It just finalizing everything. And i spend at least 1 hour a day watching other diagnosticians too. So past at least a year i have 100% accuracy in trouble shooting. Thank you so much Paul for this exciting journey.

[@ScannerDanner]

Freaking sweet story man, thank you

[@Bwelsh1981]

Paul, a good demonstration of why we cant find Technicians! Its unreal How many guys cant understand the simplicity of this. I wish when I SHOW PEOPLE simply electronics like this the majority wouldnt just stare at me like a dead fish!Keep on Teaching my friend and hopefully you will reach that Audience in the Masses!

[@pigeonsil240sx]

have them use PHET DC virtual circuit online its a free website where you build simple circuits like this and test with virtual multi meter and takes just a few seconds to get started.its been the best learning tool for me.

[@dans_Learning_Curve]

"I was wrong." Something a good man says. Great quality!

[@TheCoatneyadkins]

No doubt

[@8953147]

This turned to be a great accidental refresher video on Voltage Drop testing! Glad you fixed it correctly for everybody's sake.

[@dineshsevak150]

This is one of the best video explaining "back feeding" the circuit and classic "bad ground" problem. Extremely helpful, useful ,video well done and well explained. Many thanks for your time and effort for providing and contributing such community service.

[@ScannerDanner]

Awesome, thank you!

[@geraldc.37]

Great diag. Danner. These young'uns dont realize how valuable your knowledge is. As a retired tech I can speak to a wire repair or terminal tension was always the most difficult repair.

[@crpth1]

Starting more than 3 decades ago. One thing I learned every time I get into a new project. Clean every single Ground my eyes and hands can find (a diagram helps a lot...). That means that from old crappy VW Beettles older than myself, to way more recent cars and motorbikes. I tend to have extremely reliable vehicles, in what electrical is concerned. Never mind the fact that some had been, literally, saved from the scrap yard! ;-) With that said. Rotary tool, Dremel type, equipped with a decent wire brush. It's an invaluable ally to make short work of corroded contacts/terminals. 30~45 minutes for a car project will return years of extremely reliable work. Yes, it's a good trade, totally worth investment of time. ;-) First class video and show case. ;-)

[@85jmccoy]

Its so nice to watch a youtube video from people with brains instead of guys bickering back and forth over some freaking tools....

[@arthurbright1625]

Great video Danner I drive an hour and a half to work and enjoy your videos on my way to work and apply your teaching especially on trailer wiring back feeding grounds are a problem

[@ScannerDanner]

Awesome! Thank you!

[@EpisodeCJSII]

I have a similar issue. Same year and make car, but it's my rear blinker light. This video gives me hopes of finding my problem. Thanks man

[@TrampusWingo]

This. This is why I still subscribe to premium. Worth 10 times the price, but you keep it affordable for folks like me. Thanks man.

[@abonourabonour1006]

You are created to be a great teacher. I Thank God for knowing you

[@ScannerDanner]

Thank you Abo!

[@curtismay8323]

Wow this was so amazing one of your best videos back feeding through the parking light I didn't know it could do that my first thought was it was haunted you need to sell it get rid of it thank you so much for your videos I have learned so much.

[@juancenicerod5043]

Than you for helping me to fix my hummer h3 I had change 2 ignition coil clean the throttle sensor n throttle it self n still had a misfire , until I change the relay that you said n work just fine. Thank you guys n God bless you all.

[@ScannerDanner]

Glad it helped

[@ONETEMO]

one of the best diagnostic videos I ever watched thank you a lot Paul you are really a masterclass technician.

[@rhkips]

Finally, all the haters yelling "bad ground" in the comments are right! LOL Awesome stuff as always, Paul!

[@noelhernandez5016]

All videos you make matter a lot, doesnt matter if thats not the car you was to supposed to film. All videos and info is much appreciated. Thanks Paul and Caleb

[@ScannerDanner]

Thank you Noel!

[@brianwalk108]

You, sir, are either a genius or a wizard, most likely both. thank you for shining your knowledge on us!

[@mmokhtari6591]

Many thanks!! to you Paul, the lad behind the Camera "Great shots" and family for the video.

[@jorgevega238]

Figure it out. Use your head. Be a good technician. Awsome

[@martinrubenstein7943]

Thanks, Paul. I always appreciate the explanation of the theory, such as you did at the end. One favour, please: whenever you connect a test light, please be sure to emphasise what the alligator clip at other end is connected to ie power or ground. When you don’t emphasise it, I sometimes miss out on the information because I’m trying to work out where it must be connected to in order to react as it does. Many thanks.

[@kylefentz]

I second this

[@randywilson8300]

Great work on the explanation during the videos hope your son picks up a lot and learn as much as he could from you so your knowledge can pass down from generation to generation

[@paulfiebke3909]

Keep up the good work and may God bless you and your family most of all may God bless America 🇺🇸

[@randallcorbello2857]

Thanks for the video. It helps me learn how to troubleshoot a lot better.

[@wyattoneable]

That was actually fun. I enjoy these videos that include theory because it helps solidify my initial idea of what is wrong.

[@wilamyoukhana1109]

ScannerDanner your the best teacher ever I learned a lot of staff from u keep going god bless u

[@ScannerDanner]

Thank you!

[@Mickey_Bauer]

I had no idea i'd have this much fun watching a bad ground on a blinker. Thanks for the video!

[@steveguest8028]

Thanks Paul,I’ve seen this type of thing a number of times over the years 👍

[@nassimennajih271]

Good job sir!!! Nice troubleshooting skills.

[@hvacmangoodman4]

Man I just wanna say thank you thank you thank you thank you for your time I know I said thank you a lot but thank you! I currently drive a 21-year-old service van it would not run Well. I recently watched one of your videos about Chevrolet in that particular year needing 50 psi fuel pressure to open the injectors spider injectors that is. did a fuel pressure check after two mechanics told me it was junk. the thing is running like a beast. dude you’re the best thank you keep up the good work! If I was flush with money I’ll be sending some your way right now! But times are tough right now! God bless keep up the good work!

[@ScannerDanner]

Thank you so much for the comment and I'm glad I could help guide you on fixing your van. Good providence to you my friend

[@CubasAutomotive]

That's an extremely common issue on Chrysler. A bundle of grounds on 1 lug, but eventually they all fail, so best to fix them all at once.

[@gerrymoeller]

I agree 100%

[@MrCostyaG]

the reason why I am watching your videos is: -learning english by myself -want to change my life and profession

[@ScannerDanner]

I am honored

[@kinglangren]

I appreciate this my sons truck is acting the same way, this should give me some direction, also never really understood why a different light would come on, now it makes sense.

[@anthonyrosa4388]

yes you did change my life and my confidence i found you a long time ago THANK YOU

[@brotherbrian1]

Great video Danner. The other day, I had a a Ford Taurus where when you turned on the headlights, the right one was out, but the washer motor started spraying the windshield. Turns out the guy changed his bulb, but forgot to tighten the ground you had to move out of the way to get to it. Bad grounds can cause some crazy symptoms.

[@chadgardee1496]

If you have two lights out in the front I would check ground first Paul danner is the best I learned so much from him thanks Paul

[@ScannerDanner]

thank you Chad!

[@mikelpowl88]

I know this is an old video, but I once helped my dad replace my grandma's headlamp assemblies. They were each wired differently to the bulb sockets and it was causing weird issues with the lights and signals and we had to take them out to compare them to the original.

[@DanWallis86]

I’ve learned so much from your free stuff. I’ve just signed up to premium. Love your work mate.

[@ScannerDanner]

Much appreciated!

[@hcooper267]

Thank you for this wonderful vidio,I gat this problem in my car.

[@27evan74]

Even tho you werent planning on this video, it turned out to be very informative. Thanks for making such great videos. Ive learned a lot from you!

[@remodz6385]

I see Danner has a VW & a BMW in his shop... I love troubleshooting some good ole German engineering. Always boggles my mind

[@fire7765]

Absolutely awesome critical thinking and diagnostic skills and ur son did a good job like always.

[@billyyoder8171]

Thank you Danners cubed. Have a blessed and safe week.

[@julianarodriguez3635]

Your the man

[@bobneuman8124]

Great video , and nice meeting you and letting me get a pic with you at SS this past weekend. Brandon and Ziegler's class was great, my head felt like it was going to explode from all the knowledge I got from them both , lol

[@ScannerDanner]

Great meeting you too! Now if I had a profile picture I would know who I am talking to :-( sorry man

[@bobneuman8124]

@@ScannerDanner Sorry I did not have a picture in my profile at the time I commented ! , I was the one in Brandon's class when we were there and said that if Snap-on was to add cursors to their scopes like Pico , it would cost us an extra 5000.00 for it, lol. If that rings a bell in remembrance.

[@ScannerDanner]

Haha I definitely remember the comment! You on Facebook? If you are make sure you friend request me

[@bobneuman8124]

@@ScannerDanner I don't go on Facebook much, but I will send you a request. I have enjoyed watching your vids even though I have been in the field since 1990 because it shows me what I didn't know that I though I knew. Thank you for helping others and seeing u at training proves that teachers need training too to provide to others, God bless brother !

[@bobneuman8124]

@@ScannerDanner Also, when I send the request, it will say Bob instead of Robert on my page.

[@PaulCTownsend]

GREAT INFO THANK YOU GUYS.

[@diriazi]

You are the Master!

[@vincescalise4821]

Great video, great explanation of how the ground can back feed.. I just got your book engine performance diagnostics Sixth edition very very good information thank you Paul

[@ScannerDanner]

Thank you Vince!

[@mikechiodetti6737]

The Dodge B350 Vans 1987, 88, and 89 were famous for that problem with the rear stop/turn/tail light back feeding into the backup lights. The bulb socket would loosen up losing the ground from the reflector bolted to the body. I wrapped bare wire strands around the stop/tail light socket, soldered and taped it in place adding a terminal to the new ground wire and sandwiching it between the reflector and body ground. Don't laugh, it worked! Thorough diag with your vehicle, Good Explanation also!

[@davidljohnson8514]

This guy is just Captain badass all over. Electric cowboy at its best!

[@ScannerDanner]

just read this to my wife to reminder her who she's married too :-) Thanks man

[@target-mechanica]

Great job well done, it’s classic method but useful. I like it 👍🏻👍🏻

[@mostlymoparih5682]

Gotta love the basics. Thanks guys.

[@manuelamaya826]

Thank for family Danner, very good class.

[@victorlewis8970]

Thanks for explaining with the diagram, SD.

[@ScannerDanner]

I could have done that part better, but thank you!

[@DANNYN224]

Thanks for all you do im always excited in learning love this channel

[@juancenicerod5043]

Good job guys

[@herrkiwi3110]

Excellent as always Paul , thank you Sir !

[@andrewk778]

Always an interesting learning experience. Thank you for sharing.

[@detailedautodiagnostics]

Love this!!!

[@whitetiger8652]

Appreciate the video guys!

[@111kco111]

great video guys, very informative.

[@CXensation]

Had another combo om my son-in-laws Typical circuit like you just showed us, no light in either turn or parking. Turned out that both bulbs were shot and the park light had a missing ground : a frayed cable. A real time waster ! 😋

[@carlos92161]

Personally I appreciate it and thanks for teaching us greetings and blessings for you and all around always

[@nigelclark7360]

This bad ground was a common fault in the old days and still today. It was quite common in the seventies at night time when you are following a car and the car driver indicates to turn,you see the rear lights on one side,all start flashing, dim, this is because the indicator feed in that side is trying to ground through the other 3 grounds, which have a high resistance at the point of the ground bolt to body.. As we known electricity, all ways takes it path to ground,the easiest way ,back feeding itself through other equipment .

[@manuellamas4747]

Good video. Brothers wear same cargo shorts. It’s the Danner’s uniform. 👍🏽🇺🇸

[@ScannerDanner]

haha that was unplanned and only noticed in the edits

[@spelunkerd]

One day when I had a bad bulb in our 2000 suburban I discovered the same side marker light flashes alternating with the signal light. When the signal light flashes "on" the marker is "off", and vice versa. I scratched my head for a while until I discovered that this is a normal pattern with that generation of Chev. Engineers were faced with the challenge of making turn signals more visible from the side, and they solved the problem by creatively running ground between the two so that both would flash in an alternating pattern. I never noticed until the bulb failed and I gave it more attention.

[@oscarsmith6519]

Thanks

[@ALZWE-LIBYAN-CAR-ELECTRICIAN]

Remember me such as issue with my brother's car which is Avante hit a big nail cause coolant tube cutting then the car doesn't crancking and all light doesn't light just the high beam sign in the instrument cluster always on...this all due to Ground point which is contain alot of wires has been cut....

[@frankiev-tech4630]

Wow Paul! I'm noticing your videos are getting better and better lately with more real world scenarios. I'm sure you'll have way more material at your brother's shop. Kinda what I go through at a daily basis. At my shop...I deal with many cases with these used car dealerships with similar electrical issues and the majority of times these cars come from accidents with rebuilt titles and from auctions...I always question these customers of what type of accident or damage they come from...75% of the time these problems exist due to accidents that cause wires to stretch or bad body work. It takes a lot of attention to detail when this comes up but yeah at times I do jump wires depending the circuit to save time.

[@frankiev-tech4630]

By the way you and Eric O. are starting to inspire me to teach as well...I've been going through so many cases that haven't been seen and I felt bad not to share my experiences. Pretty soon I'll start my channel as well. You've always been an inspiration to me and your knowledge partially made me where I'm at today. I will always be thankful of sharing your knowledge to the world. God bless you and your family!

[@ScannerDanner]

@@frankiev-tech4630 awesome! I wish you good providence on this path my friend. As for the quality of the videos lately, we cannot discount my son Caleb, he has been a game changer in my opinion. His camera work and editing are second to none. Although we both dropped the ball a little in our camera angles on this video, we both felt like they should have been better, but overall still good.

[@AstonSubstantive]

Your videos are epic- thank you!

[@fieldsofomagh]

Very interesting fault finding video.

[@KobaBlack113]

Great video, because I have a very hard time trying to comprehend what voltage back feed is.

[@richardwecker8322]

Great thanks!

[@georgebonney90]

Cool video thx mr danner and caleb👍

[@neeniebob1]

KZbin advertising FIXD on your video. The way FIXD are advertising themselves and casting such a dim light on us professionals. I won't support anything that supports them. I really admire you Paul and everything you do, I'm gutted your video is being used to support FIXD.

[@ScannerDanner]

I just blocked it, please refresh this page and tell me if you see it again. Though it may take 24 hours for the block to take place. Freaking rip off b.s. auto tech bashing company can kiss my ass

[@neeniebob1]

Even more kudos to you. Last influential KZbin tech I told about this I don't follow anymore because of those ads. The fact you can and did block them Paul shows your character and dedication to our trade. Massive thumbs up to you dude!

[@ScannerDanner]

The nice thing about having a paid channel is I am no longer a slave to these advertisements. It is nice to be able to do things my way without outside influence and I am all about helping to make my trade better. If there are ads that conflict with what I believe, for sure they are getting blocked and I don't care if my ad revenue drops. Thanks for the encouragement my friend.

[@lustfulvengance]

Pay for KZbin premium and you will see ZERO ads and have ZERO frustration! Best thing I ever did! People waste so much money on shit cable tv and then refuse to pay for ad free KZbin with things that are actually worth watching!! THEN THEY COMPLAIN ABOUT AD'S 😡😡😡

[@neeniebob1]

I'm not complaining about ads. Paul understands what I meant and the issue is dealt with. Happy viewing and good choice of channel by the way.

[@capt251978]

We have the exact same building. Even the same furnaces.

[@baxrok2.]

Nice work guys. Thanks!

[@timowallin8020]

more and more new car makers are makeing art of simple light circuit. If pulp gos bad they stop sending volts to that pulp and if you tyred to fault find that without scan tool/ changeing the pulp with correct wattage pulp you get lost as you would say its the module. Those moduls can allso turn on other ligths for example safty if stop ligth pulp get burnt it can turn on eaxmple fog lits to run as stop ligths and so normal driver would say that the instrument cluster isnt working as it says fix your stoplamps! Yeah its just ligths easy to fix rigth? Specially when you have rare car in front of you and it has that system. Then you wish your scan tool knows the system goodinaf tot tell you what car sees and what it dos to safe that driver from rearending neck pain ;)

[@muresanioan7130]

gracias

[@michaelszczys8316]

Whoever is ' heaviest ' becomes the new ground. The smaller loads can ground through it, but it can't be grounded by the lighter loads.

[@ozzstars_cars]

Simple issue but you still broke a sweat Paul by that sweaty tshirt at the end. lol Great explanation of the ground circuit issue.

[@Pablo_Automotive]

Thanks for share this, you are a good techer.

[@afifmalhas2628]

hello great video but you are saying back feed ground through other brake Lite assembly but my question is why the other brake lite assembly don't share the voltage and are not blinking on those any of any sides . and when parking lite is off the turn signal signals worked you donot think ground going back to parking brake power supply not through other brakes light assembly. .

[@JoelAutomotiveInaction]

awesome teacher

[@jerrypeal653]

Well grounded diagnosis

[@ScannerDanner]

Lol

[@huzaifarashid1]

Great video man. Love your stuff Can you give the link to your test light?

[@ScannerDanner]

It's on my Amazon Affiliate page www.amazon.com/shop/scannerdanner Thank you!

[@손정민-v8k]

Awesome outstanding job have a great time thanks

[@aymenmohamed1134]

Awesome

[@mohawkmike142]

Hey Danner fans!!!! Even if he says it doesn't matter to poke holes in a ground wire. DON'T DO IT. It does matter as you can see the factory wire corroded where there was no protection. The fact that FC didn't protect the original well enough proves the point. great teacher you are Danner but you get an F here.

[@ScannerDanner]

🙄

[@mohawkmike142]

Sorry..NYSDOT tech here. we eat green wires for lunch here. Poke holes but PLEASE show repair after. You know of the clear nail polish fix I assume? works great. Even on the little hole from your PHILS probe. Holes are holes bud. @@ScannerDanner

[@davidbrown1037]

I had one a bit stranger than that years ago. My business partner had a 1980? GMC Vandura and replaced a burnt out L/H Rear Tail Light 1157 Bulb. It worked OK, BUT if he had the brakes on for 15 seconds, the dash lights and parking lights would come on. Even weirder, if he turned on the L/H Turning Signal, after about 25 seconds, the dash lights and parking lights would ALL flash with the turning signals. Remove the new 1157 Bulb and all was OK. Installed another new 1157 Bulb, and all was OK. The problem was the High Wattage Brake Light Filament in the bulb was too close to the Parking Light Filament, and when energized, it would heat up and sag into the parking light filament or support wire, passing current into the parking light circuit. It took a few moments to figure out, I have never seen that before, and will most likely never see it again. One thing that complicates troubleshooting ground problems with Dual Filament Bulbs like these is that current can flow through the Brake/Turn Filament without lighting it because it's ground path is the low wattage filament, and that limits the current enough to NOT light the Brake/Turn side. This is especially bad with trailers which are quite often poorly wired to begin with, have a hard life, and little to no maintenance. This is a hard lesson to learn for some..... you did a great job explaining it, and hopefully, someone will "Have the light come on!" BRAVO to the 3 Amigos!

[@ScannerDanner]

I feel like I could have done better on explaining that portion but thanks my friend

[@jelotech579]

Nice

[@maryreed2280]

The test light seems much more versatile than a DMM. This is a good example of when to use one.

[@rsanchez5676]

Why wouldn’t you just bidirectional test inputs and outputs quickly for the circuits in question?

[@nicknicu1787]

Great find! 👍

[@SuperSecretSquirell]

BOOM! Knowledge bomb dropped!

[@HomieHektor]

🤝

[@captaincookieandmilk6142]

If the ground that was bad had better contact with the rest of the wires through the eyelet, wouldn’t it have possibly shorted out the other wires because it had power going through it when it’s not supposed too?

[@billyr9840]

Nice !