DIY: How to Test Fuses
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- Опубликовано: 28 сен 2014
- Video tutorial on how to test a vehicle's fuses to determine if they are need of a replacement using various methods. This tutorial does include four different methods which are using a test light/lamp, testing voltage with a multimeter, doing a visual inspection, and testing for continuity with a multimeter. Fuse boxes are found on various locations throughout your vehicle depending on your make or model. Some of these locations can consist of under the dashboard, on the side of the dashboard, under the hood, in the trunk, in the glove box, under the seat, etc. You will have to consult with your vehicles owner's manual to determine where it is located. When replacing a fuse, it is mandatory to replace it with the appropriate rated fuse so you do not risk damaging your vehicle's electrical system. This particular tutorial was done on a 2003 Dodge Dakota.
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Tools/Supplies Needed:
-test light/lamp
-multimeter
Procedure:
-locate your fuse panel and remove the access cover
-determine what fuse is required to be tested
-some circuits will need to be power up, for example the ignition either needs to be on or on accessories to power up the radio
-find a sufficient ground source if you are too far away from the battery
-if using a test light/lamp, put the ground clamp on a sufficient ground located or negative battery terminal, touch the test probe on the two test points on the fuse
-if the test light/lamp does not light up on either test terminal, the circuit may not be powered up or there is an issue with the circuit
-if the test light/lamp only lights up on one test terminal and not the other, the fuse will need to be replaced
-if the test light/lamp lights up on both test terminals, the fuse is good
-if using a multimeter, set it to the DC voltage on the two place reading
-clamp the ground probe on a sufficient ground source or negative battery terminal
-using the positive probe, test the test terminals on the fuse
-if no voltage is shown, the circuit may not be powered up or there is an issue with the circuit
-if voltage is shown on one test terminal and not the other, the fuse will need to be replaced
-if voltage is shown on both test terminals, the fuse is good
-we can also do a visual inspection on the fuse, depending on the type it may or may not need to be removed
-inspect the fusible link inside the fuse to see if it's broken or there is a burnt spot on the housing
-using a multimeter we can also check for continuity
-set the multimeter to the lowest ohms setting, this can ONLY be done when the fuse is out of the vehicle otherwise you do risk the chance of damaging electronics in your vehicle
-touch the probes together to ensure the multimeter is functioning correctly
-touch each test probe on each terminal on the fuse and ensure there is continuity
-if there is no continuity, the fuse will need to be replaced
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© 4DIYers 2013
All Rights Reserved
No part of this video or any of its contents may be reproduced, copied, modified or adapted, without the prior written consent of the author. 
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Its sad that many expensive vocational and training schools cant teach as good as this video does, simple but to the point, Thank You!
Thank you so much for the kind words and feedback :)
Hand down the best beginner video on electrical auto testing. 8y ago tho still a good
Thank you so much!
Had to go back to the basics. Thanks for the vid.
Happy to help :)
Fabulous! I learned so much (and some other assumptions of prior knowledge were confirmed).
Excellent to hear and thank you for the feedback!
Very useful information thank you. God bless you.
You rock. Please come out with more videos mate. This video saved me £100. Thats what they quoted for my mercedes when I gave it for servicing in Birmingham city.;)
Thank you and awesome to hear! I'm releasing new videos every week actually :)
amazing video!
Thanks!
I always wondered what my dads screw driver with the wire was for.
JoeCnNd lol same
I pulled the wire out 😪
What is he doing with that ice pick?
good idea i never thought of that thanks
Great video man! thanks
Thank you!
Liked and subscribed! thank you for your time bro! Really!
Thank you so much for the feedback and support :)
Great video and tips.
Thank you!
Very, very good!! 😊
Thank you!
Help. I have 2 fuse that the manual say they are "ground". It's posible to use those fuse to connect the black ground wire of a hardware kit for a dash cam? It's ok to do that?
Can you test the mini circuit breaker fuse in the panel? The silver one on the left side.
good job Sir.
Thank you!
Very helpful
Thank you!
How do you test fuses while generator is off but some fuses run like the control panel but you wish to do a quick check by not pulling out the fuses or turning the generator on? Obviously voltage test would be pointless because since most fuses won’t be live so you couldn’t do the test unless using ohms/ continuity. I’m just curious the fastest way to check in that instance any suggestions?
Hi, I try to measure the voltage of all my fuses in the fuse box of my car, but all of them gives me 0V. I thought that my multimeter did not work, but it wasn't. Is there any problem on my car? I need to install a dash cam, so that's why I need to find the correct fuse. I tried also with car switched on.
Hi @4DIYers, I have a Nissan Leaf as you know if you put ON the heat in the car it reduces the range, so I decided to buy Roadpro heat 12V 300 Watt Output 25amp, the car has 15amp I think, My Question is if I increase the amp to use with Roadpro from 15amp to 25amp would it blow up anything or damage anything in the car or make any changes and will the car heat stop working if I increase fuses
thank you
Good afternoon I just checked my fuses and had the key turn all the way(not turned on) and majority of them really didnt turn my fuse light only a handful of them so i was wondering if those are all bad or do i have to turn on the truck
hi, i noticed the numbers of some fuses are backwards. another youtuber said in this way these fuses won't work because they're not put properly. is it true? i checked and also in my car some fuses are backwards
I have continuity on windsheild wiper washer fuse on the off position. Does that mean I have a short?
thank you
Glad to help out!
How do you used the test lighter to test the wires for turning signal lights. I am trying to figure out which color is for the turning signal . Thank you
Connect one to ground and back probe the connector when the circuit is activated.
good job, it helped
Thank you and don't forget to subscribe :)
Vielen Dank
Thank you
You're welcome!
Thanks
No problem :)
Tanks Man!
Glad to help out :)
This was so helpful, very grateful! Except you cut off the photo of multimeter halfway and I could not see how the probes were attached to multimeter, arrgghh!! One picture is worth a 1000 words. How do I connect the probes? Red goes where? Black on COM?
I can’t find my interior fuse box inside my 2006 base model PT Cruiser. It’s suppose to be next to my left knee but there’s no panel. I’ve found the obd sensor cord but not the fuse box... 🤦🏼♀️ Can you help please?
Have you tried on the side of the dashboard where you open the door? Might have a hidden removable panel there.
Hey, great intro to fuse testing! I'm testing fuses in my car to see which ones are permanelty on, and which ones turn on with the car so I can tap into them. Is it safe for me to put the red end of my multimeter inside the fuse of the box to see if I get a reading?
Yes
To use a test light ....does the negative cable on battery need to be disconnected?? I just wanted to do it right and know for sure.
Nope, leave it connected. Otherwise the system won't have power to illuminate the test light.
Damn - just test each and every fuse on the vehicle, with key on - takes about 8 minutes!
Hi. I have a question.. Earlier Afternoon i was changing me car's rear roof head bulb to some Led SMD bulb. Firstly it turned on and i was going to put back its cover holder. But suddenly a little spark (which i'd just noticed) came from light and my cars parking lights started to blink. The problem is when i close all the doors the roof light keeps getting On (the button position in middle) . Ok when i lock my car with remote with all the doors are locked. It indicates by beeping like the door is still open.
I don't know whether it's some sensor issue or what.i already checked Fuses.
kindly help me.
Quite possibly there was a fault with the led bulb and now it's back feeding power. Some led bulbs can only be installed one way, others aren't a very good quality and will fail quickly. Try switching back to the old bulb to see if the problem is still there.
+4DIYers. ok problem solved. There was a kit which got short ciruit. i had to buy a new kit. i don't know what kind of kit is this. it damaged its computer system kit which is located under the dashboard..
but anyways Thank you sir ! :)
I was confused about the icepick with the light bulb.. how do you "ground it" . what did he plug it in to? he said something about clamping something to the alternator wut
That is a test light, various styles are available on the market today. It has a wire coming out of the back of the handle which is for the ground and has an alligator clamp. It needs to be connected to a sufficient ground source such as the negative battery post. But as an alternative I used the door hinge bolt in the door jamb.
Is it absolutely necessary to unplug the battery to just test a fuse
dc voltage setting on the multi meter???????
thanks
+Ecoloro Manifesta DC
My 99 toyota tercel has no 12 v constant voltage, i dont get it. Blown fuses maybe ? 🤔
He doesn't show how the ground is connected. I understand the test light is clipped on to the door handle but by what size bolt? How is the negative lead of the Multimeter connected to stay on?
Any bare metal bolt which connects to the main body of a vehicle. If you do not have one, run a jumper cable and attach it to the main strut bolts on the shock tower. Or if the battery is closer, just use the negative battery terminal. The negative lead just has an alligator clip.
Thank you very much for your quick response. This helps a lot and saves me money from having to buy a test light. I never knew you could just test the battery drop across the fuse and not have to pull it for a visual/continuity test.
thanx
my headlights nor my dashboard light isn't working but my high beams work and my tail lights work every light works but those two I don't understand if it was a fuse wouldn't those other lights turn off also? I have a c230 2002 mercedes kompressor if anyone has any ideas of what could be wrong please let me know.
Most likely a faulty fuse. Be sure to use a multimeter as a visual inspection doesn't always work. Some cars may have multiple low amperage circuits under one fuse, but a high amperage draw on one circuit, such as the high beams being separate. Don't forget to subscribe :)
+4DIYers I've checked all the fuses front back under the wheel under hood and their all good but it still dosent work idk what's going on any idea?
Great vid but I had to slow it down to 75 % as you talk too fast. Question: I saw another vid and the guy showed what was the Load side and the Draw side of the fuse. He put the fuse back in the fuse box after testing an empty slot. If it showed 0 it was the Draw side - if it showed 12, it was the Load side. So I assume that the fuse has to be put back in correctly so the Load side matches up in the fuse box? Or does it really matter? I noticed on the 20 amp fuse in the beginning that it was in the opposite way of the others, so it can be put in either way? Thanks!
Thank you! My new videos are much more refined. Technically the supply side can be checked with the fuse in place as well, there are little cutouts on the top of the fuse to place a probe. The orientation of the fuse doesn't matter, it works either way. The only thing is don't mix up their ratings. A lower rated fuse on a higher amperage circuit will just keep blowing a fuse. However a higher rated fuse on a lower amperage circuit won't blow when it should and instead will cause other parts of the circuit to overheat, damaging components and possibly causing a fire.
@@4DIYers Thank you, Sir, for taking the time to explain. Cheers, Bob
is it possible for a fuse to be connected but just not a good fuse
+David Jacobo No... Did you test the fuse and it has continuity??? And the circuit it's connected to isn't functioning???
No I just polled one at a time and look at them
+David Jacobo Unfortunately just looking at them doesn't always work. The best way is to test each one.
4DIYers Yess
Hi, is it safe to use this tool with vehicle on and engine running?
Yes, it is.
I have a Kia Sorento 05 for some reason when I turn on the head lights the gauge light and tailgate lights doesn't turn on. anyone know why?
+Hooman sth Check all the fuses, some circuits may share the same fuse. Other issues can also be a faulty bulb, bad ground, faulty light socket, switch issue, or lighting module. But the best place to start is with the fuses and do not just visually inspect them.
Thanks for the great advice
@@patriotir what did you find out?
@@GrungeVeins I found out that no one knew what was wrong so I got rid of it lol
Iam in need of some info if someone out there can help. I got a 1994 E350 it was crazy cold out and I started it drove it for 5 minutes to the mall and turned it off. I returned and it would just click. Tried to boost it and it just clicked. Thought it was the starter solenoid and changed it. Tried to start it and everything was dead. No power to dash or anywhere.battery still checks out good, got power from battery to solenoid, checked all fuses under dash and hood all looked good. Tried to test with test light no power to any of them. Any help would be appreciated.
Have you load tested the battery or was it just with a multimeter?
@@4DIYers it was load tested with 2 different machines and it tested ok
You may have a bad wire, either for power or ground or even a faulty ignition switch ruclips.net/video/E1nlbeXtVmQ/видео.html
What does it mean when there is no power to fuse with accersories on ?
Try the run circuit instead and see if there's power. It may not be operated on the accessories circuit or there could be a fault.
Maybe it's just me. But wouldn't it be easier to use the multimeter and set it to check continuity? No need to turn anything on or find ground.
+ComPrt3 Unfortunately no. As mentioned in the video, doing an ohms/continuity test will send a small amount of power through the circuit. You can back feed power and do greatly risk damaging electrical components, especially on newer vehicles equipped with different computers.
I use the continuity test (combined with diode test on some DMMs) because I like to hear the beep.
Bada bing. Bada boom. Beep. Not blown.
However, that's with the fuse removed from the panel, and if the visual hasn't already confirmed the fuse is blown.
Now, when my fuses blow, I replace them with fuses that have an LED that light ups when blown, especially for the cigarette lighter power port accessory outlets. Running an inverter to charge a laptop, iPad, a couple phones and operate a big screen TV often causes an overcurrent situation.
Mark the panel where fuses frequently blow with fingernail polish.
@@4DIYers if we disconnect the battery, will it then be ok to use or is the same issue still possible? Thanks in advance
you never checked the fuses with yellow cover on them,why
It's the exact same process for the yellow fuses. The color only dictates the amperage rating of each fuse.
1:03 two fuse diagrams go round the outside, round the outside, round the outside.
Not getting electricity to one of my fuses
+Andres Marquez Check your relay first, depending on what the circuit is. Then test for continuity between the fuse and the relay.
@@4DIYers I have the same issue, one fuse inside car the does not any power to it, but the fuse under the hood does have power? i am diagnosing an AC on Haundai Elantra 2011. any help would be greatly appreciated.
So pissed, because I've been using it incorrectly for years. NO WONDER IT DIDN'T WORK!
Thanks