Milwaukee M12 Blinking Lights Problem Fix
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- Опубліковано 25 лип 2024
- Is your M12 tool blinking a Christmas light pattern at you sometimes when you try to use it? I may just have the solution for you.
I saw a post on the Garage Journal where someone was having an issue with their M12 Fuel Impact where it would blink at them when they pulled the trigger. The Milwaukee tools use blink codes to indicate that the tool has identified a condition in which it should not run.
Some of the possibilities are when the battery is too low, when the battery is overheating, or when the tool has stalled. After investigating the contacts on my tool and battery a little bit I discovered that if the tool cannot read the temperature sensor in the battery, it will not run.
By putting tape over the terminal I can simulate a condition where either the tool or battery contact are corroded and not making a good connection.
If you are intermittently getting this issue, it may be a good idea to check out the contacts and clean them if necessary. It is a very cheap and quick thing to try to fix an expensive tool. You've really got nothing to lose. - Навчання та стиль
![How To Fix Milwaukee M12 FUEL Ratchets [Cordless Ratchet Repair]](http://i.ytimg.com/vi/R2f96gKe1XQ/mqdefault.jpg)
*Awesome impact **MyBest.Tools** Takes tires off in a second. Plenty of power for what I’ve used it for - rotating tires. Using it on 3rd setting for removal and 2nd setting for tightening lugs.*
I used ua-cam.com/users/postUgkx4ynqaujg7rZKFapA8s29kTpRszJGa3-K this for the first time today to replace the front wheel bearing on my rwd 98 dodge dakota. This had absolutely no issue removing or reinstalling the lug nuts and it took off the axle nut without any struggle. Sounds like it's got some muscle to it. Time will tell
This is a great tidbit, what ended up happening with my M12 is that the contact in the battery was pushed in, I bent it out with a little ice pick and it works great now because it wasn't making full contact. 👍🏻
I had done your test procedure into my Milwaukee m12 hex two speed screw driver, having an intermittent problem of starting & not starting, even if the battery is fully charged. I just cleaned contacts on the battery terminals and into the tool itself. It works and try several times. I really appreciate you uploaded this video and really help. Thank you so much and have a good day.
I have the M12 multi tool, the oscillating tool. I was putting in fresh batteries and got blinky lights. Your video helped me a lot! I bent the inner temperature lead down a bit to contact the battery more and everything works like new! Thank you for the help!
Good tips! Great video! Sometimes the battery is just too warm. I recently had this happen with the 18v system. The battery was in a leaf blower, and it was about 75 and sunny... Hence my reason for visiting this video. I took it inside, out if the sun and let it cool off. It was working again in no time.
Used this trick on a 7+ year old drill. It worked like a charm. Once I took the drill apart I could see that the temp contact was cracked and not lining up properly. Used some crazy glue to put it back in place, and sure enough it worked. Thabks for the upload!
Had my drill sitting in my closet for over 6 months thinking it was broke and i was going to have to pay to take it to a repair shop. Well I was wrong. I watched this video and fixed my drill in under 2 minutes with a butterknife. Thank You!!!
We have a 3/8” impact and the terminal seemed to not be very far bent out. We used a small pick and bent the terminal out. That seems to have fixed the problem. Thanks for pointing in the right direction!
Thank you very much for your VERY helpful instructions. I had this problem intermittently and then I'd tap the tool and no "Christmas lights" until I press the trigger again... With your info, I inserted a long flat screwdriver in the drill and moved the temperature tip (clip) in the drill slightly forward. Most likely, it was not making good contact before. I no longer have this problem! Thank you so much for saving me the hassle of the return.
Glad this helped you get your tool fixed! I think the design of the M12 contacts being as small as they are and just sticking out unsupported means they sometimes get a little bent and don't make good contact. Maybe in newer tools Milwaukee will make some slight change to fix these issues but they are sometimes pretty simple to solve yourself.
bought some copy batteries. had the 1-3,2-4 lights flashing, watched this vid. bent the relevant pin on the battery out a little. rocking and rolling. thanks for the video.
In my case, that terminal was slightly bent inward / not making good contact. Wouldn’t have thought to check its condition without your vid, so thanks!!
great job brochacho! my brand new M12, never used, did the Christmas lights thing today on the first lug nut of my flat tire. it is a Christmas present from my wife. I had the battery from my light in it...not the original smaller sized one. I will look closer at the contact and also try different batteries.
I have 4 sets of the fuel 12v impact / drill sets. With 8 tools I have 3 now displaying this condition. Very annoying. There needs to be a factory fix for this. Thank you for the well done and informative video.
Worked for me, thanks for the video. I had some black residue probably from some melted mastic pad on the inside of the drill and on both the battery contact and the temp contact. I could move the battery around and the drill would work depending on how far the battery was pushed in, after cleaning no issues.
Wow. Thank you!!!! I actually called Milwaukee tech support and the guy said I needed a new circuit board. I pressed him a bit, saying is there a contact that might be intermittent because when I snap the same battery back in, it usually works. No go with him. "There are no replaceable parts. You have to replace the control board." $100 later, I still had the same problem. This is really sucky of Milwaukee. I will check what you said here--it all makes sense--and report back. But you are aces in any case, because throwing away good parts is not only expensive and frustrating but wasteful. Let's get back to smarts, common sense, and repair-savvy.
My Milwaukee M12 Rotary Tool started blinking and not working. I’m glad I found your video. I’m going to attempt to clean temperature contact and see what happens 👍🏻
One of the temp tabs on one of my batteries is lower in position. Thank you for this video! Frigging pissing me off getting Christmas lights!!!
I have a brand new 3/8 extended reach ratchet kit. The 12v battery that came with it has acted this way since I bought it. Thanks for the tip. I don't know that the contacts would be bad but I don't what else to try. I bought a 4 amp battery to use and have never had one bit of problem with that battery. Ok, I just came back from checking my battery if I knew how to add a picture I would. YOU WERE RIGHT! That one tab was pushed out of alignment, once I got it back to close to the others it works great. Thanks so much for showing us this little tip. Excellent job!
Thank you! My contact was somehow bent back a tad far. Prying it out made contact and it's good to got!
Great job, I had same blinking lights. I'd loaned out unit, he didn't say it didn't work anylonger. The temp terminal was bent on impact. After I straightened terminal it works perfect,Thank you!
This guy has a lot of smarts I have been having this issue and I use these tools professionally especially the 3/8 ratchet and long ratchet this worked on everyone of my tools the only thing I could add is you may have to squeeze the prongs to make better contact when battery is installed due to excessive removal and installation of battery the terminals can wear or bent to where they don’t make great contact with the terminal at all times but over all great video and thank you for the help
Cheers for the imfo.
The temp contact in my m12 wrench just needed cleaning and bending inwards towards the T battery contact.
Alls good now.
Spot on advice. Thanks
Thanks so much for the tips! I have a Nextec 12v multi-tool that was blinking so I cleaned the two main contacts on the tool and bent the contract (T) on the tool and bent the corresponding contact on the battery and it works like a charm!
MoneyManHolmes
Thanks. I have that exact same tool and it will run for about 15 seconds, then shut off and blink the lights. The battery is still cold, so I know it is some type of malfunction. I will try that. The tool we own is actually quite rare these days.
Edit: actually mine is the rotary tool. Still going to try your fix and see what happens.
Thanks for the tip. My M12 fuel stubby will intermittently have this problem and it's only remedied by re-inserting the battery. I'll check the contacts when I get to work. Hopefully I'll remember to report back.
Thank you, great video, My pin on the M12 battery was too far in. Pulled it out a little and now it works.
Thank you! Bought new big Chinese batteries when I bought my new tool. That tab was bent and stuck in the battery. I pulled it out and straightened it. Works perfect now!
Thanks for the fix! Cleaned the contact inside the drill and on the battery and it now works! Saved me money!
I just bought a M12 havkzall and the red blinky was happening. Thanks to you I looked inside and there was some glue on the temp sensor! Scratched it off with a knife and she's running great! Thank you
Great Video, I think is the only one in youtube showing this kind of troubles. Thank you very much!
thank you, my tool just started acting up today, now i know what to look for, great video
Cheers buddy just saved me cost of new batteries, was told by supplier they needed replacing. Cleaned terminal and good as new.
Wow this helped me. I was going to return, but there apparently is a little glue inside the tool metal plate contacting the battery. Thank you a ton
I cleaned all the contacts on my 18 volt sawzall and it started working again. Thank you very much for the video
Thanks for sharing this. I have a M12 Long Reach ratchet that is doing this. I took a look at the contact in the ratchet and it looked clean because the tool is almost brand new but I cleaned it anyway along with all the contacts on the batteries. None of my other M12 tools have this issue so it's got to be something with that long reach ratchet only. Hopefully cleaning the contact did the trick. It's seriously annoying when working on a vehicle and that ratchet keeping failing over and over again.
I foundthat this was my problem but with a different twist. The little sensor tab was bent upward 90° and therefore would not contact the battery tab. I carefully straightened it and voila, working impact again. Thanks for the video.
I was actually having issue charging my battery and the charger was flashing lights.... wiped off all the contact points, and now it’s charging just fine! Thank you for the video.
Awesome! Lets hope the fix lasts and you don't have any more issues for a while.
Thanks bro. See ya in garage journal
Just cleaned the terminal, didn't look real dirty, but it worked. Thanks alot.
Thank you!! Found my thermistor tab pushed back and to the right so it wasn’t making contact with the tool connection.
Thanks for sharing, Billy
Hi, I found your clip interesting because I am having problems with the flashing lights.
I did as you suggested and cleaned the T terminal on both the battery and drill/driver and sorry to say it didn't help. This happens with both of my batteries. Batteries are not hot because the tool is kept in the trunk of my car and it is winter now. It usually starts happening after being used for 10-15 min, not constant use.
looking forward to your input before I send it in for repair.
Wow I just about went and bought a new battery because one of the clips is broke on my battery and I was taping the battery to the drill and now I realize that the reason it wasn't working was because the tape was covering the temperature sensor thank you very helpful
Interesting take, sounds like you have put a lot of thought towards this.
+Defender Chassis Diagnostics and sensors are my bread and butter at work so I do think about this a lot. I wish I could find a service manual or something from Milwaukee that describes the blink patterns. I was thinking of faking up a battery so I could vary the temperature and voltage and test some of the tools to see what they do at different voltage levels and temperatures. Thanks for watching.
I will be playing a good trick on my buddy now with the tape. My m18 1/2" impactor blinks and I will definitely be cleaning the terminals now. Thank you for the information.
you sick f
My lights would flashed and not work. I would end up taking the battery in and out a couple times until the lights didn't flash and then sometimes the impact would work with very low speed or torque. I ended up bending the small metal terminal in the drill slightly for a better connection with the battery pack. Put a battery in and had full speed and torque like when I first bought it! Thanks a lot for the video and help!
Paulo
I bent the contact plate of the battery and it was fixed.Thank you!!!
I was having the blinking lights problem but it was the charger blinking red & green for all my batteries. I bent the temperature prong out a little and VOILA it's working again!
Thanks 4 sharing!
Update 11-4-2021: Spoke too soon, problem still exists.
iv had my Milwaukee stuff do the blinking lights several times. I just figure the battery's were dead. looks like I need to clean the terminals. thanks for the vid!
+Stephen Cox There might be something else wrong too but if this is all that's wrong it's a cheap and easy fix! Let me know what happens. Thanks for watching.
I have a millwauki soldering iron that all the sudden won't get hot and the green light just flashes...I took it apart and cannot see any obvious signs of overheating on the board...any idea how to fix that?
Could be. Ran into this problem yesterday. Was 95 degrees but feel like temp was 125. Humid as heck. This may have been my problem will recheck this today!
Omg thank you thank you thank you a thousand times over, I thought I damaged my tool to the point of wanting to return it, this solves my problem
Worked perfectly after i bent the contact out just a hair. You're the man!
Thank you! I'm not sure if you still check these comments or not but I just had to post my appreciation. A couple of weeks ago I bought an m12 Milwaukee ProPEX Expander tool on Craigslist. I buy a lot of Milwaukee tools on Craigslist. Never had an issue with any tool but this expander. I got it for 80.00, they run 400.00 new. The one I bought didn't come with batteries. Just the tool, 3 tips, charger, grease and the hard case. Met the guy, he used his battery to show me it worked and i bought it thinking I got another steal. I get home and slide in a battery and get the blinking lights. i tried 7 other batteries...same thing. The 8th battery worked for a few times and then the blinking lights. I have been searching for an answer with no luck until your video. As you suggested, I sprayed contact cleaner inside the handle to the heat sensing contact and sure as hell on the batteries work! I bet the guy who sold me the tool new this problem was going on. Why else sell for 60 bucks? I have over 20 different m18 and m12 tools. Any problems I have in the future I will search for you. Thanks again, Ken.
Typo there at the end. It wasn't 60.00 it was 80.00. A great deal nonetheless.
I do still read all my comments! Awesome story. I'm glad this helped! I've been wanting to make some more indepth videos about how the Milwaukee battery system works and how to troubleshoot it because I think a lot of people out there are probably having issues with their tools that may have a simple fix. Just need the weather to cool off a bit so I can get back out there in the garage. Also 80$ for that PEX expander is definitely a steal if you need one!
I have the same M12 3/8" IMPACT WITH A XC6.0 battery for 3 weeks now. Worked fine the first week I had it. Went on vacation for 12 days and today I used it for the first time. It did something very similar except my lights don't flash at all. The tool acts as if it is completely dead. If I remove and reinstall the battery then it comes alive untill I set the tool down. If I try to use it seconds after it may do the same thing. No lights, no operation and all I do is slide the battery out then back in and it works. I have tried squeezing and flexing the body , trigger, direction switch while actuating the trigger to see if that would aggravate it but nothing happens until I remove and reinstall the battery. I noticed the contact you are talking about and thought of "tweaking" it a bit to give it more tension against the corresponding battery contact but did not want to tamper since I just bought it and have a warranty. After seeing your video I think I'm going to give it a try. Thanks
It works clean terminals, same thing happened with half inch impact...THANKS A BUNCH
Going to try this tomorrow, thank-you!!!
Great tip will remember it if I get problems
Wow, didn’t think it would work. I thought I had to buy a new one cause I had drop it. Battery came out. Lights was doing it after installing the battery. Used contact cleaner & it work. Thanks..... for saving me some money.
My m12 drill did the same thing. I tried cleaning the terminal you spoke of. Still wouldn’t work so I took a small screwdriver and bent the top right terminal out just a little bit. Works good as new now
My snub nose is having this issue! I’m happy to see a fix!
It happened to me today. Will def clean out the contact. Thanks
This good to know, i currently am having a similar issue with my milwaukee m12 fuel ratchet. When I first out the battery in and hit the button it works fine but then when I go to hit the button again it does the blinking lights but I can take the battery out and then put it back in and it works. I just got it rebuilt for a second time and this was not an issue prior to rebuild. I am going to look into this.
loved it
Thank you
, I bought one new tool and was thinking return it but
I paid cash and guy didnt want acept it
so now Im so happy ,
gracias compa😍
Been getting this on my m12 stapler. Worth a try thanks.
Thanks...I tweaked a couple of connectors on the charger and it works fine.
Had the Christmas lights problem with an impact drill (6 months old) and a hacksaw (brand new) so having read this I thought it must be the batteries, which are several years old. Sure enough the top right contact in both (temperature I think) was too deep. I used a very small screwdriver to ease them out and no problems since!
Mine the was contact pushed in on the battery and was sometimes touching. Thank you so much
Fantastic fix. Thank you
Thanks! I was juuuust about to go buy a new drill. You saved me
Not all hero’s wear a cape!! You sir are a hero😀
Thank you Josh you’re awesome that’s very smart
Thank you so much.... had a XC battery that keep doing this. After watching I found the contact was bent back, I used a screwdriver to move it forward and the battery works perfect
Nice! Glad to help solve that issue.
This just saved my soldering iron. Thanks!
Thanks a lot man! Saved my M12!
Super thankful for this video 💪🏻👏🏻
recently bought my first Milwaukee tools which are the M12 line....
Love them so far can they are not overpowering for what I need to use them for at the moment.
I would def like the see some tear down videos of at least the impact, maybe the impact driver. Thanks! Subscribed.
+Kyle Burns I've come to really love the M12 line of tools. They provide a great value, have a huge variety and the batteries are dirt cheap! (Comparatively...)
There should be some teardowns coming out soon once I figure out how exactly I'm going to film the close up details and oscilloscope traces. First planned item is the M12 battery charger.
Thanks for watching!
I broke the battery connector inside the handle of my 2401-20 (dropped my drill ). Milwaukee will not sell me just the connector. I need to order the entire switch assembly for $40.00. almost the cost of the bare tool :( the fix would be an easy .99 cent solder job with a
new connector.
Yeah that does suck. I've been trying to find a way to source those connectors for some projects but the best I've come up with so far is buying either the M12 Incandescent flash light, or the M12 USB power supply. Both can be had for ~24$ on eBay. You can take them apart and grab the connector out of it.
That happened to me too! I will try that tomorrow, thank you!
Get it working?
Great, hopefully this is the problem with mine. Reckon I'm going to measure what resistance it wants to see for a normal operating temperature and modify the tool internally becaue I'm tired of running into this problem on-site when I'm trying to get the job done.
Got my rotary tool to run thanks for information
That's great! Thank you so much!
Thank you so much Josh
I have a problem with milwaukee c12dd, drill works, but no soft start or immediate stop, which of the components on the circuit board is faulty?
Thank you very much worked a treat 👍
thanks for the explanation
Thx ,I gone try this I got the problem all the time . Regarts from the Netherlands
Thank you good sir just fixed my M18
Or like mine it was bent sideways so it wasn’t touching at all thank you you’re A smart guy thank you so much smart guy GOD BLESS your I’m my Prayers
This helped me with my m12 1/2in Brushless impact
I got this issue on the new m12 vac. Would love to see you take that apart
Thank you so much my drill works fine now.
Cool, it works to me. My Milwaukee has been fixed. Perfect, thank you so much my friend. 😊😊😊😊
Thanks.... That is some great info
Some tear down videos would be great.
+barra220 Hopefully I'll be coming out with some soon. Just working out the details of filming close ups and the oscilloscope screen. Thanks for watching!
We have been throwing batteries away where I work because of this. The terminals on the battery are bent in. My guess. Someone's tool has a bent terminal and is bending the batteries. Thanks! I brought some batteries home to mess with and found your video
This helped me out so much I bought 4 of eBay generic ones it did the light thing and noticed the pins pushed back so flexed them forward works fine hell yeaaahhh
I have a m18 combo set. Brushed. One battery works fine and the other when I use the impact or drill they both work then stop and have one blinking bar on the battery? Any thought?
Thank for information. Clean the terminal. Still didn't work 😕. Bend the terminal in a little work like a charm.
Tanks a lot for that video help me to fix my m12 tool
Awesome, that worked for me. New tool had some junk on it from factory.
that junk is dielectrical grease which prevents corrosion and provides better contact for connectors
The 3 terminals in front are for balancing the charge and temp. Check from negative to each one and u will get 4v, 8v. And 0v. 0v is temp
Good video just had this problem I just actually remove the battery and slid it in and out a few times and I guess that clean the contacts but my tool was like 2 you're as old and like new so I was surprised there was that problem