Brilliant .... in the first 90 seconds you explained how to use the sensor to ground and switch the relay. I’ve watched ten clips without one explaining that! Thank you CC 👍

Rewirng my whole car. Watched a lot videos on wiring different things and now that I have found Chris Craft he is the go to guy. Speaks clearly to the point. Thanks Chris

Bro this is literally the best KZfaq instructional video on here... I already knew all this stuff but I never could have put it together for the people like this... make more videos

No matter how old this is..... when info is explained well like this video and IM NOT LOOKING AT SOMEONE DRIVING DOWN THE ROAD TALKING TO A CAMERA AND NOT DOING THE WORK OR UGLY SHOT OF THERE DOG OR BARFING FROM CAMERA SPINS.... the information is priceless. thanks buddy.

Not usually a KZfaq commenter, but that video was INCREDIBLY well done. Thanks for the work!

As a person that jus did a swap I’ve been losing it for a week not knowing how to get both to work on hi-speed and you jus made this so easy and simple for me I can’t thank you enough

Wow. I had to stare at your 2 speed wiring diagram for a long, long time , tracing the current path, before I “got it”. You, sir, are a genius.

Ohhh...wait a minute.....Think I just found one of your vids on fusebox. You have now reached SUPER GANGSTA STATUS. You are the man!!! Thanks again!!!

When I watch your videos I feel like a mechanical electrician, thank you :)

my car is a 98 with climate control full blown electronics , i would not mind paying for a full scematic with digram, an supplyes needed to put this thing to gether, i just got the car 6 mo ago an not to have driven it yet, with 60k miles, seen your videos, AMAZING HOW YOU DO IT, you have not disaponited me yet, very good. please excuse the spelling , 60 persent blind now,

Chris, I appreciate your instructionals. Really down to earth and easy/simple to understand. Thank you.

I did the 2 speed with 3 relays this video was as clear as it gets I have no wiring skills what so ever and I have to admit it came out pretty good

Really helpful! I narrowed down the problem on our car when the right fan would never work. Turned out to be the fan itself. Thank you for this video!

Thanks so much for posting this Chris. I also installed the two speed, three relay option on my 76' Ford truck. I used three 16" fans two pushers and one puller with a shroud. The trucks stays on low speed with all three fans most of the time and you can barely hear them running. The high speed kick in however, is a different story. I used a dashpot from a 79 carb which is wired to the middle relay 87a and kicks my idle speed up when the three fans go to high speed. I also ran 86 on the first relay to the ignition switch and the fans turn off with the key. Thanks again!!

Bruh… I swear to god I am not THAT dumb, but geezus Louise’s I have been wiring and rewiring these damn fans and finally said eff it I’ll search the tube for some help. Thanks for breaking it down for me to understand. Having you literally draw it out made me understand the whole thing. Thanks again brother!

This is as good as is going to get explaining I watched professionals explain it and I couldn't get it you simplified everything as simple as it can be I give you AAA+

Peace- thanks. I’ve been doing this for years, but your explanation was one of the best ways I’ve ever seen! Appreciate your efforts & time.

Dude....that video was gansta!!! That was one of the Best diagrams I've seen in a very long time. Keep up he good work. Now... If you can do a diagram of wiring up a fuse box in a 1969 pontiac firebird. That would be SUPER GANGSTA!!!. Thanks again.

Best darn video on youtube!!!! Easy to understand, AND you showed the 3 relay setup most people have no clue about! Thanks for explaining it so easy

Really worth information specially about connecting 87A pole which is complicated for some technicians, you made it very clear. Thank you

Hi Chris. Thank you for the great video. One thing I noted, at high temp (with the BMW two-step switch) or A/C on signal spliced into the high side sensor wire, only fan 2 will spin in high speed as the fan 1 relay is not energized and will not spin at all (Ref: your Step 2 High screenshot). I solved this by installing a bypass with an inline rectifier diode from the high speed to the low speed signal wire. ...and yes, I have watched the part 2 video.

I love your video from the bottom of my heart ! You are true Auto-Electrical Professor ! Your demo is so clear and simple ! Your simplified experiment model can be used by ASE lecture! We - all viewers really appreciate your generous shareing your knowledge with us ! Lord Bless U !

Chris, I've been working with your layout for the two speed fan set up. I just discovered the BMW 2 temp switch, and that is how I'm going now. I am using 3 relays, as you did, middle one SPDT. 1 and 3, SPST. I am running switched 12v power to the BMW switch. From that switch, I am running the low temp wire to terminal 86, on relay #1. The high temp signal to 86, on both relay #2. and #3. #85 on all 3 relays go to ground, and #87 on relay #2 goes to ground. I hope I have it right, 'cause it even makes sense! Thank you for your help.

Hey Chris, I had a flex-a-lite a-lite dual fan with the temp controller and hooked it up exactly the way flex-a-lite directions explained on a 2004 Suburban. The problem I had was that the controller has only one small positive and negative wires going to the battery controlling both fans coming on at the same time drawing double the amps through the small positive and negative wires which is a bottle neck for the amps going through it for both fans coming on. I found out that's what the funny noise is when the fans both kick on and struggles coming on. Over time, the red wire from the temp controller gets really hot and eventually it started blowing the fuse on that red wire to the battery. Also, over time, it makes the fan motors get hot as well from struggling and eventually burns the motors up. I went through 2 sets of motors in two years. I eventually removed the controller and ran each fan with their own relay and power basically in parallel besides in series like the controller is wired as and it makes a big difference on how they turn on and no more noise, fan struggles, blowing fuses and burning up fan motors. Also with the temp controller wired up it also drains the battery faster due to hi amp draw with both fans coming on through a smaller wire which then the alternator could not even closely keep up and had to replace the alternator with a 250 amp mechman alternator to keep the battery full at all times when fans are wired through the temp controller. Don't know if flex-a-lite know about this issue with their temp controller, but they need to figure out a different way with their current temp controller wire setup. I was wondering if there was any way you could test this issue and verify the problems I had. So far it sounded like it when you connected the twmp controller, you just need to run it longer and over a period of time to get the same issues I had and I have seen others having the same issue.

Perfect video! Great explanation. I dont typically leave comments. But when they help me out this much i feel obligated. Great job man

Thanks man! You are a genius and a great teacher! I was always Leary of wiring and never used a relay. I'm going to start using relays from now on!

Great video. I might need to watch it a couple more times to get it exactly but this exactly what I needed

Great stuff, explains things simple and to the point, the way it should be, without a bunch of fluff. Great job.👍

Thank you for this video! I wasn't wanting to use the thermal switch this made it really easy to see how to wire with a simple switch.

Thank you for all the information. I am getting ready to install a single pulling fan in my 54 chevy truck with a. Aluminum radiator, and home made shroud.

This is actually a very good explanation, but sadly most won't watch this and put the time in to actually learn

I subscribed ! This is the only video i have found that explains cooling fans. I have an automotive tech. degree... And yet i needed every bit of info that you shared! Thank you!

hello I am installing ac to my land cruiser 1972 FJ40, thanks to your video I solved my problem many thanks and continue uploading videos

Hey Chris, thanks for taking the time to do this. You made me understand very clear. I subscribed 👍

thank you, Chris!!!! I know nothing about wiring and I do want to add an Efan. This video, encourages me to try!!! thank you!!!!!!!

Well done video. I learned more in this one video than all other ones combined. I just needed to know how to trigger the fan through a ground instead of 12v

Thanks for the help. Just the tutorial I needed to help me wire two fans for my transmission cooler allowing for a low setting (running in series) and a high sitting (running in parallel). Rather than using thermal sensor switches, however, I wired them to a DPDT switch on my dash.

Es el primer video que enseña paso a paso la conexión de los relay y con 2 ventiladores 👍

I Liked it. From the number of thumbs down, it's clearly over the heads of some folks that do not have the fundamental understanding of relays and voltages and parallel vs series paths. My Flex-A-Lite controller just went out, and I'm deciding whether to bypass it and replace with this relay setup, or just pay the money and replace the control module. Thanks for the instructional.

Thank you for taking the time to post this, works great Cortina MK3 V8

Hell of a video.....clear and concise

Great video, really appreciate your time creating this video!! I install mine in minutes after reviewing your video.

Chris, I think what I'm going to do is use 2- 4 pin relayes with a flex-a-lite temperature controller for the 2 fans,, And a 3rd relay for the A.C. Unit to both fans. I'm going to run them separately from each other in case there's a problem in the future. I understand the 4 pin relay Well (how they work). I still would appreciate the pictures though. Thankyou so much for your video's!!! God Bless

the best instructing procedures ever sincerely thank you very much

This is what I needed to show my buddies why & how you use a 2 speed set up with 2 fans and dump the mechanical fan

thanks chris hope you staying dry during this flood man

Nice educational video! Been thinking about adding some electrical fans for my truck. I'm interested in learning more about the wiring so it works correctly. Thank you, good sir.

Awesome! I've never seen the Low / High setup like that! I'm going to try it out.

Awesome! Thanks for taking the time to put this and your other relay video together!

Best video covering this subject. Makes total sense. Thanks!

Very good video for more understanding on car relay fans

Best fan controller vid on the internet.

Thanks man I love you 😁 I spend 4 month trying too do these way 2 speed vans thanks

Nice presentation. Thanks for taking the time.

I hate wiring! Definitely gonna help me ! I searched these and really people do a crappy job explaining it Nice vid man!👍 Yeah I like the soft start option lot easier on the electronics Having sensors to turn them off and on is the way to go 👍 I would forget to turn them off and come out to a dead battery lol I think FI-Tech has a controller built into it my dream purchase down the road 👍

Best description of this set up I've seen!

Man i have learned so much from your videos. Just realized you're from Houston. Thank you and prayers up

Very well explained. Gonna do the two speed setup on my car

Great clear video of how to wire radiator fans👍

I WACHED YOUR VIDEOS SO MANY TIMES ;;THAT IS BECAUSE THEY ARE VERY INTERESTING GOOD JOB

What can I say that hasn't already been said; thank you Sir.

Thanks for this video. Great instructions and perfect execution. Both real life application and written down. You nailed it, my avalanche is forever in your debt. Stupid clutch fan 👿

COOL system buddy. You're really good at explaining things in a really easy to get way!

I finally got it!!!!!! Thank you again

Thank you for the good information. I learned a lot from you. Thank you so much.

I'm impressed --- good work!

Second fan can be powered by the AC switch like a regular wiring harness.

I never knew running fans in series cuts the speed in half. I usually run one fan with a 3ohm resistor for low speed. I've used flexalite in the past don't much like them. There whicked expensive I've spent 400 on a fan setup that's nuts when you can get a better fan setup from a salvage yard for next to nothing. That fan controller you have is crazy priced a few relays neatly packed fuck that.

Excellent explanation! Thanks!

Thank you for making this wiring relay unit video. Awesome lecturer! Subscribed.

Great video!!! This will help many people wire up fans the right way!!!

You did a great job with this video thanks for taken the time to do it.

Good knowledge and good explanation sir

Thanks bud. Nailed my fan upgrade with this video 👌

Great video. Never knew about the 2 speed and was about to gamble on the Derale which has horrible reviews. I have their version of your FL210 (have had them also worked for many years). The ones have now pull just under 25 amps ea and had issues w every auto controller ( Hayden 👎🏻) so just had manual switch’s to HD relays but I’ll be adding one more to slow them down. I’ve sucked one to many birds into my grill on high😂🤦🏻‍♂️

This video is amazing. Thank you!

Great vid. I have my second fan wired to come on when the AC is turned on 👍🏻

Good explain I like your video thank you so much 👍👍👍👍👍💯💯😎

This video is great, thanks

Awesome video very nice and yes those fans look like that monsters good luck with your setup

Thanks for making this!

Great video. Very clear and informative. Thanks.

Chris thank you so much for this tutorial! I can easily wire up my fans on my GTO now!

Good video…. ,Thank you for taking the time to make the video

layout was exxcellent and descriptive informative!

Thanks great educational video

Yeah, this is an awesome video! Explains some great options. Thanks!!!

great job chris. you make something that seems complicated now easy. keep up the vids...

Dude that's awesome, my relay #3 has no current on pin 30 relay it's good I just dont know where to look at now I should check fan #1

Great bro, very well explained and demonstrated with example...

Got a like and a sub for this. Been looking for this video for a while now. I like how You broke it down nice and simple.

dude, awesome video

With single fan you can use on 4 pin 85 for temp sensor 87 to the fan 86 ignition switch or toggle switch as ignition switch

I'm studying real hard, thanks

Nicely done.

Thank You, very helpfull

Thank you - super high quality content, man. Two thumbs way tf up.

Very nice video.

OUTSTANDING VIDEO!!!!! Thank you!