Lexus IS250 Alternator Replacement Step By Step | DIY

In today's episode we are removing and replacing a bad alternator in a 2012 Lexus IS 250. The battery won't keep a charge even though it is brand new, which is usually a indicator that the alternator is bad. Overall replacing the alternator is pretty easy and only need a few tools. Hope this video is helpful!

*I realized upon re-watching this that I somehow did not include the clip where I torque the bolts down. The torque specs are 32ft-lbs for the bolts holding the alternator in.

~~ Here is a few good alternator options if you don't want to get one locally ~~

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[Mechani_Cole]

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Thanks for watching!

[conanzhao]

Another job done on my IS 350C thanks to this video. I had to watch it in conjunction with another video to get the full picture. This is perhaps the most annoying repair I've done thanks to those hard to reach nuts and clips. About 5-6 hours total, including time spent having to go shopping for long extention bars. Someone else commented on a left-handed back-reach for that nut in the far back, this tip helped a lot. You gotta take off your gloves and feel it with your fingers. I bought the mirror that he used in the video, thinking it was a stupid purchase, but I ended up using it a lot. Another tip I would give is that when you finally get the new alternator in place after dragging your balls through a mile of broken glass, don't be tempted to screw in all the secondary nuts. I made the mistake of saving the two primary bolts for last (not intentional. I forgot about them until everything else was screwed back in), and thus the Primary-short bolt was crossed, I had to use a long wrench to really screw it in. If i had to do it again, i'd definitely put in the long and short-primary bolts in first, then the last nut in the back, and then all the secondary nuts after.

[johnnygraves]

This is literally what the internet is for
Perfect video
I would have been stuck figuring out that bracket for hours
Thank you thank you thank you

[JamesPerriam]

Thanks a lot Cole . I am a retired Motor technician and am used to changing items like this . However the IS 250 is very awkward and your video is excellent, particularly explaining where the hidden rear braxket is. Thanks very much . James Perriam Exeter U K

[EinJESUS]

Great explainations on everything. Having never changed one of these before, watching this gave me the confidence to do it myself.. took me twice as long, and I bled a little, and had to phone a friend.. but it saved me 2 days and $800!

[EsterWreK]

THANK YOU! just replaced alternator 2006 is 250 followed your instructions that rear bracket bolt had my knuckles bleeding but without this video i wouldnt have been able to replace it myself saved $$ im sure most mechanics wouldnt even quote a price till they saw it only problem was it didnt run 😂😂😂

[midweststreetleagueracing]

Dude this video helped so much. Alternator went out yesterday on my Is250 I had one in this morning after about 1.5 hours . Watching this before definitely saved me the headache of finding that back bracket . Other than that the install was smooth as butter 🔥

[ChrisDaye-zvuw]

Best video on YT on how to replace the alternator! I just finished this job last night after stripping the top long bolt on the front of the alternator (SMH) and taking off the wrong nut under the manifold. But, After resolving these hiccups the removal and install were pretty smooth. I did find that using my left hand (kind of reaching backwards) to find the bracket nut under the manifold made it easier to place my extension. Thanks again for a great tutorial.

[smokerong]

Thanks man. My electrical power went out on my 2009 IS250 when i was driving at night and only left with dashboard and daytime running lights, power steering was out too, believed is due to electric power steering motor. Engine still running. Managed to get home and troubleshoot the battery is not charging. Your video helped me decide to change the alternator myself. update to the above. I took my own sweet time so 6 hours to change it out including buying tools that i do not have in the process, no power tools. the back bracket can be seen if we lower a miners light in. the hardest for me is to fit up the new alternator into the tight fit area where the long bolt goes on to. 9/16 socket broke while breaking torque on the 2 mounting bolts suggest to use penetrating spray first if possible.

[Bondovian]

Professional video man... good lighting, smooth music and great explanation on removal and install. Top notch!

[michaelgordon]

The trick with the stud! I watched a couple videos of people fighting that bracket bolt…finally found your video and popped it right out. You are a G, thank you.

[joesanchez]

Just got done with this job took me about 2 hours best video out there easier then removing that ecu box thanks man 👍

[FatalJSUS]

Thank you sir. Life saver wouldn't have found the bolt by the manifold without your help.

[iaturtleboy]

I winged it and started randomly tearing into my is250 on my own and then got stuck. Looked for videos trying to figure out how to get the old alt pulled out. Your tip with the stud really helped me, (I didn’t know they came out )Thank you.

[Kinkyliftas]

This may be a old video but bro we’ve been working on the car for three days and if I didn’t see your turbo socket suggestion it was game over for me man Thankyou so much for making this

[joemonday]

Your tutorial video helped me to replace the alternator myself and saved me some money $$$
Thank you!

[brandonlamb]

Solid video, helped me with my wife’s 2010 IS250, thank you. Had to use the double nut method on the stud, as I didn’t have any e-torx, but worked fine using the 10mm nuts I took off of the wire harness mounts. Side note: probably good to just replace the idler/tensioner pulley while you’re in there. Hers only has 140, 000 miles and it’s going out

[alexslaydon]

Great video, my one thing along the way I learned that I want to pass along to my fellow diy mechanic is that the stud does not need to be removed to take out/install the new alternator. Unplug the clip going into the fan then You can pull the alternator forwards then to the left where the shallow groove of the alternator will allow clearance of the stud and slide right up it. Might have to yank it a bit but it will save you a 40$ stud kit.

[HungTran-dqut]

What spray did you use to clean up the plastic covers? Thank you!

[ricardoar]

I just wanted to share my appreciation for the great video you posted. I followed it and was able to successfully change the alternator of a 2008 is250. Thank you for all of the details and for showing the video in card to see places.