How to test a small engine coil using a Multimeter.

In this video we are going to test some coils from various machines to see if they are good or if they are ready for the bin. #testingcoils #smallenginerepair
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[@Bensgarage]

A cheeky Tuesday video for your entertainment. Hopefully you will have learnt something from this one.

[@MrDogfish83]

Every single video on this subject (not just yours) are like “here’s how to test a coil. I don’t know what the numbers for this unit should be but it’s showing some numbers so this one is good. I won’t mention what numbers you might expect for a bad coil, or what goes wrong with a coil or anything. Hope that helps!”

[@ronalddaub9740]

You don't need to know the exact numbers as long as they're not shorted or open and they show a decent amount of resistance forget the number unless you have them in front of you Always check primary to ground Secondary to ground They will never have the same ohms from primary winding. To secondary winding

[@GPS.GhostPirateSloan]

Define “decent amount of resistance”. We are looking for a number here, down to r nearest 100th if you don’t mind lmaooo

[@MrDogfish83]

@@ronalddaub9740that’s great but they don’t explain that either. These videos are always a black box unless you already know what you’re doing

[@taxicamel]

That's not true. A couple of videos have stated a reading in the "3 to 5 area", based on resistance setting 20K. It is quite clear most videos are published by people who only work on these engines. Keep in mind, they are very likely NOT engineers nor are they going to lookup, research the engineering data t know exactly what the "working range" test results should be .....unless of course, they have actually taken a Briggs and Stratten course that details ALL important engine details. Just my observation, most of the videos are done by people who have some "experience" servicing. I have yet to hear anyone even bother going into the theory of operation and magneto to explain how rock solid (explosion proof) this engine design is. As soon as I hear one of these "experts" title their video with "motor" or mention "motor" ....I am on to the next video. .

[@gregoryeaton9426]

Good details on these coils thanks

[@runningremingtons]

Thanks this video has helped me a bunch of times

[@haylee4607]

Easy peasy thanks for the video.

[@davidwillis5016]

Thanks for da info broster

[@flemmingranch8777]

A very good and informative video….

[@lukeingram7655]

thanks, this definitely helped!

[@onceawhile563]

Thank you this will help me with my small engines test at school

[@onceawhile563]

I did not study till the last momment so yea

[@michaeldominy2084]

I like it, 😊better than some of those trying to show you. 🤔.

[@jdprice3043]

Thank you

[@rodgraff1782]

You are only testing the secondary of the transformer. The primary, with its electronics, has to be tested also. That is what failed in my coil. You test the male spade terminal where the on of switch connects, to the metal part of the coil. There should be a reading in ohms, but much smaller. Mine was open. The on off switch, and it’s wiring shorts the primary coil to ground, shutting off the machine if the switch or wiring is shorted, the machine won’t start either.

[@adeyemibabatunde1814]

Thanks, this wasn't mentioned in a video of >5minutes

[@volkmarmaleika1623]

I have learned something, THANKS... How is this, I have a NO SPARK condition and the coil was test by a shop here in Seguin TX good, but after reinstalling still no spark. Yesterday it ran a little while, and latter never again. I tested the coil with 20K OHMs and got a -1 reading... a sign it has gone bad..

[@edfrench3329]

Thanks!

[@user-ln3sj6rz1v]

I like them glasses.. thanks for the video

[@jaimeramirez-zt9dd]

My southland edger has a reading of 10.59 at settings 20k ohms on multimeter and it wont spark the sparkplug unless i remove the ignition and kill switch wires

[@1skinnypuppy]

That’s what I’ve learned about testing coils, however I called the saw shop today and they told me that that test doesn’t work. Can you believe that, they told me, that test doesn’t work. One of the oldest saw shops in my area says that test doesn’t work. I’m not impressed

[@petersack5074]

5:04 Hi Ben, from Alberta Canada. That gap, between those coil pickups, and the rotary flywheel, should be 10,000 of an inch. Or, the thickness of a standard business card. They work well, and are just the right size. Thanks.

[@adeyemibabatunde1814]

Thanks

[@MrOlgrumpy]

10 thousanths of an inch,or 1/100th

[@trickydicky274]

​@@MrOlgrumpy10 thousands of an inch is nothing like 1/100th!!!

[@garybray3614]

.016 inches stock is the standard business card thickness googled it. ten thousands of inch is .0001

[@trickydicky274]

@@garybray3614 ten thousandth of an inch is, 0.0010" not 0001!!!

[@TheUltimate65]

Its the test the same fore coil fit on engine wihout magnetic ignition too , kiopor ig 770 fore exsample

[@90FF1]

Looks good in checking secondary resistance. That's just one step. How do you test the embedded primary circuitry in seal(potted) ignition coil pack? Thanks for the instructional video.

[@ronalddaub9740]

It's not like there are not wires running out. 😮

[@ronalddaub9740]

Make a pigtail just for checking

[@phillipdavis4507]

Love your Australian accent! 😁👍🇺🇸

[@Bensgarage]

Being that I'm English, is that comment good or bad.

[@davidwarner6755]

Stihl FS70R Strimmer...no spark. Coil, coil gap, plug, switch and wires all check good. Any ideas what else to check next?

[@enricotheunissen2653]

188F WF150508 What is the reading i should get to make sure its still working as there is no spark when doing the sparkplug test

[@mickwolf1077]

Ahh that's good, I picked up a blower with weak spark and coil reads 3.98k ohm. Spark plug centre electrode reads 18.6k ohm so might try a new plug and get new fuel primer lines. Thanks

[@davidwillis5016]

Isn't that way to high? Supposed to be like 2.500 to 5000 when set on 20k?

[@mickwolf1077]

@@davidwillis5016 once I put new fuel lines on and put it together it worked well. It was a freebie so I'm not complaining.

[@zandor5657]

thanks for posting -am trying to get a spark on an little used but fairly old Honda generator -am told the coil module is obsolete and not obtainable- could a substitute be used and could the coil/spark module be repairable

[@Bensgarage]

You could check to see if your old obsolete coil had any replacements, other wise you would have to try to match it from something else. But you would need to make sure the poles are the same, as in distance, or the timing will be out. As for repairing the old one, I have no idea. Maybe someone could fix it.

[@billcallahan9303]

A tip! Anybody with aging equipment, buy a coil! I've e got a Troy Bilt Pressure Washer, 2015, coil went bad. No problem! I'll buy another one! Spent a solid week trying to find one. NOBODY HAS THEM! Warehouses out. Briggs out. Dealers out. Troy out. A perfectly good 7 year old Pressure Washer down for lack of a coil. Buy A Coil

[@90FF1]

Same for my otherwise perfect, well maintained, to good for the land fill, Echo GT1200 string trimmer, circa 1993.

[@antking8847]

Was the bloke who invented the Multimeter called Sherlock Ohms?

[@Bensgarage]

Oh dear, was that one you had on the back burner or did you just think it up?

[@antking8847]

@@Bensgarage off the cuff - sorry lol

[@mrnuthatch7004]

I'm so bad with electrical. Can someone explain why the coil is outputting information even when the magneto isn't passing it?

[@MsLincos]

You only test the resistance (Ohm) of the internal wires of the coil.

[@valentingrguric9215]

Imam primedbu na Instrument nije približio da se vidi jer nisam razumeo šta govori inače ok je izlagnje.Hvala

[@thomaselliott6617]

So what should the reading be if the coil is bad??

[@Bensgarage]

You would have to check the specs for the coil you were testing, if it tested outside the range specified then it's no good.

[@xx3868]

Worse if your engine sort of runs ok but shuts down after 10-20 mins hot and fuel system is ok?? Drove me crazy till i realized the coil was de- laminating and shorting when HOT! I guess to test you could put a hair dryer on the coil and watch the resistance go down a bit? and then suddenly short out!!

[@ronalddaub9740]

Tayrall fixes all said ohm meters are stupid. The next day drag someone out to check a circuit His teeth fell out.😂

[@oldguy8177able]

i've found if reading all over the place then its bad

[@feel7251]

I got the general idea but you made quiet a few mistakes , sorry thught I might mention it so you next vid will come out better'

[@ronbishop4057]

Many multimeter are auto-ranging. So if you get a reading of 4.54, that could be 4.54 ohms, 4.54 k ohms or 4.54 m ohms. That makes a difference.

[@ronalddaub9740]

No. Not if you know

[@glyndavies5671]

Hi Ben. What if the coil is down to earth?. I haven't seen you test those coils for shorting down to earth here. Yes, you have the HT coil resistance, but if it is down to earth then it is faulty. Your shut off switch shorts it down to earth to stop it.

[@petersack5074]

Correct, Glyn !

[@frankdavidson9675]

the test you just did was checking for an open winding thats all the ohms reading tells you the fact that you obtained a reading at all tells you coil is not open but it could have shorted winding ----- spinning fly wheel with plugs out and screw driver inserted into plug is a good test for spark ---if wood ruff key is damaged and fly wheel not lined up correct will show no spark before you start replacing coils veryfi wood key is ok on fly wheel this put magnet at right place at right time

[@rickybailey7123]

It will spark with a bad key way the motor will just be out of time bud !!hope this helps someone 25 plus years auto !!

[@rodgraff1782]

@@rickybailey7123 partially or fully sheared flywheel keys are common in lawn mowers if the blade hits something solid such as a rock.

[@tomnaquin8903]

A coil can check good but cut out when it gets hot after 10 minutes of running. If that happens, just get a new coil.

[@ronalddaub9740]

Never throw parked at a machine find out why before you buy another part

[@jamesborton9237]

Terrible visuals, I couldn't see where you were touching. Need better camera angle of the COIL, not back of your hand.

[@facereader99]

Confusing. Sorry.

[@laneball5262]

lol l P