Why load a circuit?
Вставка
- Опубліковано 23 лип 2020
- This is a quick video showing why you should use an incandescent light to properly load test your powers and grounds. Using just powerprobe tip doesn’t show that bad ground and either does the led bulb. Don’t get burned!
- Авто та транспорт
Sometimes newer is not better. i just bought another test light because I'm hunting down a weird issue with my truck. Had trouble finding a test light with a incandescent bulb. I already have a digital one. Thanks for showing us a great load drop test.
I was taught to always do a loaded circuit test.
Thats exactly what you did.
Great diagnosis mate
Thank you sir!! I spent years not loading a circuit and it’s bit me in the past.
The way to check for a background with a power probe is to Apply power to it and if the ground is good the breaker should Pop immediately
Short, sweet, and to the point. Great vid man. Love the way you respond to comments. Best of luck.
Thanks for stopping by Darren! Appreciate it man.
Thank you Cody. Good job. Have a blessed and safe week to you and your family.
Thank you Billy, you do the same my friend
Great tip. I try to get into the habit of testing with load. Makes a big difference in diagnosis. Thanks brother
No joke bro, I’ve been burned in the past too from not properly loading a circuit
That's a fantastic demonstration. Thank you very much Cody.
Thank you for watching Wyatt
Simple stuff but so so important. Nice quick tip vid
Awesome Cody!!! Thanks for sharing
Quick & dirty!! Beautiful, but often overlooked test! 10 thumbs up! 🙂🤗👍🏻👍🏻
Haha figured I had to film this since I get questioned daily why do I use a test light 🤦♂️😂
Yes...yes, 🎤 drop!
Seen too many guys, including myself go down the wrong path for tool variables! It definitely makes us check things twice before calling it "good" with a quick preliminary check without question!
Loved this video...great points and stellar video as always brother!
Thanks brother! I’ve been guilty of doing old testing wrong in the past and I’ve been burned lol
Like many tech's, im a statistic of not loading the circuit myself but now ive learned and makes a tech way more confident i think the diagnosis and verification. Great job Cody and hell im even sharing this video with the guys i work with, one doesnt like electrical lol and the other well loves to ohm out, not that thats the wrong way just i think load testing, its more reliable when checking integrity!!!
Brillant video, and totally agree, load the circuit. Just because you do not have a short to ground or an open, does not mean you do not have high resistance 👍
Exactly buddy!
Excellent video 👊🏻
I've also been using taillight bulbs and other higher wattage bulbs. Also sometime hook them up in tandem or even series. I'm in Minnesota, where rust and corrosion is a serious problem. It's usually bad connection or rotten wires. Hardly ever have to replace a module unless it's really corroded.
That’s the beauty of the Incandescent lights and adding lights to get to the amperage you desire.
The sad part is that younger techs are buying the led test lights and think they give the proper information. It’s a tool, you need to learn the limitations of your tools. Incandescent test lights are the way to go in almost all instances when checking a circuit.
I couldn’t say it better myself. The problem is the tool guys want to make a sale and even then don’t understand “loading the circuit”
Great video Cody! The tool guys have been coming in lately trying to sell “wireless test lights” and I have been telling them to keep them out of my shop for this exact reason haha!
Wtf wireless!?!? 😂😂😂OMG this is total job security now 😂
Cody’s Auto Diagnostics you haven’t seen those yet? You ground the test light by touching metal with your free hand!
Voltage Drop Diagnostics oh I have seen one of those a couple years ago from a guy I use to work with. I laughed when he showed it to me 😂
i bought one back in 1987 (or somewhere there abouts). so they've been out for a long time. once i got burnt on using it a few times i gave it the semi truck stress test under the tires. it didnt make it!!!
Kinda like Fluke's T6-600 open fork electrical tester (inductive), which requires one to touch an conductive pad on the back to "ground" itself. You're the ground. Most electricians I know avoid it...
Great example sir, I’ve been using just the power probe.
I’ve been burned with the pp and tip voltage testing myself.
This right here, that is one of the most misunderstood symptoms of troubleshooting. I heared all the time no I've got powers and grounds I checked and it's 12 volts at the you fill in the blank, and I'm like well have you really tested it 🙂
Nice job 👍
Excellent video man!! I wish this is something SI would have guys test. Ive taught my guys to load test always and have different light bulbs made up to load circuits.
Absolutely brother! It would be nice if there was a tool that had one light to vary the amperage draw, so wouldn’t need multiple lights taking up toolbox space lol. May have to see if a tool can be made🤔
@@codysautodiagnosticsprogra8706 they used to sell "decade box" used to put different loads on circuit to test voltage drops.it was a board with about 15 switches all with differnt amp draws
Nice example of a load test that you can trust. Cheers
Cheers mate
Nice job.....!!!
Thanks for the video. Do you use a LoadPro?
Learned me something new today.
Nice!!
Still use an incandescent test light ,it's the same one you have there it's just branded MAC tools had it for years and has show me many times high resistance in a feed or ground line .
Good example Cody and Keep up the good work
Love that little light!
What light is it? I have the otc 3633, love the size but not the red bulb, or do you know any other bulb to replace the otc original?
I can’t see a number on it but it’s a dome light bulb
Cody, you are AWESOME brotha so were was the problem at the main ground on the body or some where else thank you.
Waiting on approval right now to dig into harness. G100 was good lol
Great Video
Thank you
Great video! And seems people still don't understand how important load testing a circuit is!
Seriously bro that’s why I did this test. I just got asked the other day “why should I use a test light” 🤦♂️
@@codysautodiagnosticsprogra8706 lol although this is an old video i still love it man... yea dude.. lol you may get asked why you use test light and i seem to get asked, well did you ohm it out.. im like.. checking resistance isnt wrong but you're not load testing..
Great video so the second tester is that wire to positive on battery? Just getting into diagnostics and load testing is something I'm looking into thanks
Great to no these things great job
Thank you
Nice !
Ty sir
I always load circuit. Been burned to many times.
Me too!!
The best test! better than the manufacturer's ohms test on the circuits. 😂
Oh man the the good ol ohm test 😂
thanks for the fast reply brotha one more thing i did see VW on this car is this the same engine on dodge 4.0 lt and you were hooked the test lite on B+ and the O2 sensor ground with car running or just key on engine off sorry for dragging on as always really enjoyable to learn from the master. cheeeeers
Yes buddy this is basically a dodge with vw badging. Yes is was hooked to bat power so my test light is searching for a ground. I first tested with engine running but realized ground was bad with engine on or engine engine off
so true Cody iv seen a case study where bad spark plugs causing a flyback voltage to PCM caused those same codes Cody how do i buy one of your Pressure pulse sensors? phone website ? all the best man
Hey Mark! Best way to get ahold of me is at codysautodisgnsotics@gmail.com or I’m also on fb at Cody’s auto diagnostics. Look forward to hearing from you
thanks
Good old fashioned test light😉
KNOWLEDGEABLE Cody Auto Diagnostics
Tutorial great Thank you very much helpful video ,bottle of water 💧 very good for your body, take care, have a great day
Cody Auto Diagnostics
From Nick Ayivor from London England UK 🇬🇧
Glad it was helpful!
On a light like that would you typically change the bulb to target a specific load or just go by brightness....just comparing it to using a bulb like others use.
The best test is to check violate with the load of the test light at the same time. This will tell you your voltage drop not just by looking at the brightness
Nice job, what incandescent light is that? Every time i see circuit high codes i assume open or unplugged 🤔
It’s an OTC test light buddy
So if all you had was a multimeter could you not ohm out the wire and see a high resistance value and be able to go off of that that it’s a ground wire issue?
Or are you saying that your resistance would show fine because you are not under a load therefore misleading you making you think everything is fine.
What kind of tool is that? The red one sir? Thanks
Nice job Cody this is a really important video. Looks like we have 3 parts cannon Hero’s hitting the thumbs down lol I myself 👍🏻 thumbs up brother
Haha those thumbs downs happen like 2 seconds after I post the video 😂😂😂 did you even watch the video Karen 🤦♂️😂
Cody, did you happen to connect your dvom to it while the test light was connected to see how much of a drop it was ? Just curious.
No buddy I didn’t which I thought about after filming 🤦♂️
@@codysautodiagnosticsprogra8706 Good call on were the problem was near the splice, because I noticed in the diagram the EGR is on the same ground and if it was the eyelet, it would have effected it as well I believe 👍
You are absolutely correct sir. I noticed the egr on shared a ground but didn’t code so that tells me it’s farther up the path
Hey Cody great video hope you and your family are doing well. I was wondering if you have seen the test light made by lisle company part #28800. Just came across this on a video its a led test light with a digital display and has a button you press to put a 800 ma draw on the circuit so you can see the voltage drop. I guess its similar to the load pro.
Hey bud, everything is going good over here, hope all is well for you
I haven’t seen that test light yet but I’ll check it out. Thanks for the part number!
Just grabbed the test light you mentioned, damn this thing is pretty damn sweet! Thank you for sharing bro.
Good video. I keep an old analog Simpson VOM around also. Nor smart enough to outthink impedance ranges on digital meters. Just simpler to check with an analog, especially on FET controlled outputs.
Could you please eleborate on the theory behind your thinking. Load testing opened a whole new world for me some time ago. Hope there's something in what you say to bullet proof my diagnostics. Thanks
@@tharindutest9930 I will try. Cody did a great job with this video but IMHO it would have been clearer if he would have hooked the incandescent test light to a good ground after his test. To highlight the difference. The light would have been bright meaning good ground and power. In the video the light is dim and seems to flicker meaning bad ground.
In circuits controlled by Field Effect Transistors there can be something called leakage current aka "ghost voltage" A Digital Volt Ohm (DVOM) is so sensitive it detects that. Because a DVOM put no significant load on the circuit. So you get a reading that is not really there. As soon as a load is put on it it fails. LEDs draw minute amounts of amperage so they do not provide enough load to fail the circuit.
The "old school" analog meters DO put a useful load circuit. If he had used an analog meter he would have read either zero or very low voltage. I have a couple test lights, some homemade. They each draw a different amount of amperage.. 0.8, 2.1 and 2.9A, I have them marked. I am putting a link to a doc. that does explains about the FET's. Link is good for 4 days. Hope it works in youtube. I am using dropbox. The link is safe. Hope this helps. www.dropbox.com/t/E5l4lE8TBBoQmPKN
To check to see if it can carry the load
Yes sir!!
Can you do this with a multimeter for a resistance check or are you checking ohms?
Ram Rajkumar Yes you can do a resistance check but I’ve been burned too many times but not properly loading a circuit which has made me misdiagnosed vehicles. Adding a test light and loading that circuit clearly shows a fault
@@codysautodiagnosticsprogra8706 thank you because im trying my best to learn and i figured why not ask whats the best way to check wire integrity thank you for taking your time out to reach out this means alot im studying avionics in college in Florida and please keep putting videos out very addicted on ur vids
no a ohms check will not be a good test.if you took one strand of wire from starter wire it would read the same as the entire starter cable in ohms would read.what would happen if you tried to crank a engine with a strand of wire?
now if you load tested that strand of wire with a bulb you would see a huge differece in dimness compared to the starter cable.
Chrysler with a bad ground imagine that!
😂😂 no joke
Nice work , power probe failure lol .
Yiu know how many times I have gotten its this component and I tested and then I load the circuit to tell them it's a wiring or a voktage/ground supply issue.
Trust me I know what your saying hints why I wanted to show this video. I see techs fail to load a circuit daily.
Hummm interesting how did you load the circuit
Why not go from battery negative to o2 sensor ground and voltage drop it while still plugged in?
I definitely could have done that but grabbed I usually grab my test light first for any power or ground issues nowadays
voltage drop is always the best method but can only be done when you have current flow.therfore this draw test should be a trick everyone should know because many times we dont have current flow hense why were working on the car...you could however simulate a circuit by wiring in a bulb that would draw around the same amps as the device and do a voltage drop on a system that didnt have current.
@@codysautodiagnosticsprogra8706 Hi Cody, This popped up on my feed. Great video. I'm not an automotive tech, but I am schooled in electronic systems. I use a multimeter to check from the ground wire to the frame across the ground connection. The trick is the meter has to be on the mega-ohm scale. To make sure it is set right, I pinch one lead in my left fingers and the other in my right fingers. If the meter is set right, I get a reading. If it is not (too low of setting) I get OL. Once the meter is set properly, I compare the reading across the ground connection with what I get when I touch the two test leads together. I believe this method is even more sensitive than the incandescent light bulb. Play with it and you'll have a back up for your method.
PS: My first method would be to loosen the ground terminal, spray on some WD-40, wiggle it around, and re-tighten it. I give every ground point, and battery terminals, a squirt of WD-40 at every oil change.
Harbor freight sells a good test light. I have a few of them and use them with my powerprobe
Yes sir they do. I’ve got a couple of those too.
@@codysautodiagnosticsprogra8706 I agree on how you can't really rely on LED test lights. They don't draw enough current on the circuit
@@codysautodiagnosticsprogra8706 I have a load pro and I hardly use it
I have one as well and used it maybe twice. It would be a great tool if it wasn’t so big and awkward
sad part is a volt drop with a meter would show it but with such a small current you'd need a really good meter
Very good point!
Or better yet a scope
I just made the same mistake on a Nissan and shame on me , everything pointed to a ground issue . Intermitted CAN communication error . Tested my grounds the same like you did except the load test because I thought what good would that do .
Buddy, we have ALL been there lol.
Was the problem on a splice ?
Yes sir
I use a Load Pro. Also, why didn't you show the Snap On (Power Probe) hot shot test to prove it's inaccurate? You have to be careful with the old style light if you are around computer circuits.
I didn’t show the hot shot test because I’ve already showed the issue with the hot shot test in another video. You are correct about using a test light on computer circuits but remember I was on the sensor ground wire on chassis, not a computer controlled ground.
So what was actually wrong with the ground?
There was bad connection at a splice connector in the harness
Is this something that the scope could have caught?
Yes sir scope would show the ground voltage being raised from 0
Cody’s Auto Diagnostics how high would you expect it to go? And is that why a circuit high code usually indicates a ground problem? Cause high represents above zero?
higher amperage draw from test light
Yes sir
How do you know how many amps to load which circuit? For example, 2amp bulb for solenoid circuit? Is a test light load good enough just for sensor wires?
Depends on how many amps that circuit is made to run. If I was testing a fuel pump I would use my sealed beam headlight that draws 7.5 amps compared to this little light that pulls less then 100mv
Cody’s Auto Diagnostics one more question, how would you be able to tell how many amps it was made for?🤔
If there is a fuse for that circuit then that would be best case Scenario. Any computer controlled powers or grounds I always start with my 80mv test light
@@codysautodiagnosticsprogra8706 mA not mV
I've made high amp test lights with some headlight bulbs and side marker lights to have even higher draw. The headlight is at 4-5 amps. I prefer the draw approximate the component's draw. In this case, test light is good enough. Testing a heater circuit, I would prefer the light bulb tester.
Yes sir I agree with you on the size of the light to use but figured I would grab my low amperage light to show how that one can find ground issues as well more then the pp or led
how do you estimate?do you estimate by how much amp a device normally draws then use a bulb rated around same?where do you get the info to calculate what the amp draw is? i suppose you could just use a meter or amp clamp but then again the device your fixing would not be workinf so im just looking for knoelege,thanks.
I haven't pulled my power probe out for like 3 years.
Haha me either. Funny thing is I have the hook, Snap-on, and pp4 and they just sit there. It use to be my “go to” tool but not anymore.
thats what SHE said! sorry couldnt resist lol
i thought the siern was coming for the snap on power probe tester for overpriced tool lol
😂😂
Load Pro commercial without using a Load Pro...
E4tr1
WHAT DO YOU CALL INTELLECTUAL AND ACCOMPLISHED ADD THREE MORE PROFICIENT AND PRODIGY AND QUICK-WITTED THE ANSWER IS Cody's Auto Diagnostics & Programming LLC
My Mentor Cody's Auto Diagnostics & Programming LLC
👍
God bless you and all your family around you , Cody's Auto Diagnostics & Programming LLC
From Nick Ayivor from London England UK 🇬🇧 ⏰️ 22:31pm