How to Build a Double Pull Double Throw (DPDT) Relay, From Standard 5 Wire 12V Relays
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- Опубліковано 2 бер 2021
- This video will show you how to wire two standard 5 wire 12V relay together to move a regular DC motor in forward or reverses This can be used for any application where you need to reverse the 12V current. Using two. Single Pull Double Throw (SPDT) relays you can create a Double Pull Double Throw (DPDT) relay. This allows you to use standard, off the shelf, parts instead of harder to find double throw relays, and the cost is about the same.
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I have watched a lot of videos on relays and you by far have the best explanation on how to do this. Thank you, you took all of the confusion out.
You nailed it, well explained evny my Grandmother understood everything.
Thank for the excellent tutorial. I feel smarter now after watching this informative video. The idea of a joystick controller for the snowblower chute is way cool. 👍🏻 Subbed
We like it as well. If I were to do it again I plan to add a 12V DC to 24DC converter to speed up the rotation.
Finally, a clear example for using 2 five pin relays for reversing. I have a street rod and was looking for a video for weeks and this will work perfectly for my windows and power locks.
Glad it helped. We used this the first time to do our windows, doors and other items on a 4x4 expedition van we built. Its nice to be able to just ground the switch and run ground wires to the relays instead of power. Its a much safer approach as well. If you are wiring up the car also look at Smart 12V fuse blocks, they light up when the fuse blows. Its a great way to quickly tell which fuse has blown.
You could have seen one of my videos and understood it in 2 min. By the way you shouldn't call then 5 pin relays. They are SPDT relays Bosch style. Calling them 5 pin might get you the wrong ones when you go to buy them. Some 5 Pin relays are actually Single pole Single throw. Where pins 87 and what looks to be 87a is just another 87 no "a".
Thanks for a perfect explanation of how a reversing circuit works. I am upgrading my side mirrors from manual fold to power fold. I saw how to do this on another video, but the guy only provided a diagram. I bench tested the circuit and it worked perfectly. It came to me that it had to be a reversing circuit when I was trying to figure out if I needed to ground the mirrors to test them (I didn't). I know it works, but with your help I know HOW it works. Kudos!
Glad it helped. It took me a long time to figure this out myself and I wanted to save the information in a video
Thank you! Exactly what I was looking for.!
Thank you! I've learned more in this one video than the last 3 I have seen so far! I'm looking to alternate between two power sources.
G'Day HOTRDD - Machines......Great video, explanation and diagrams - Just hooking up a toolbox with two central locking actuators using relays and switch and this worked a treat.
Your demo with very clear explanations solved the issue of reversing polarity on my car seat motors.i spent 2 days connecting wires on one relay.i noticed i needed a second relay and even that the vids i watched did not help till i watched this .now i need 5 extra relays to move seat in every direction i now have only 3 relays so i can move seat up and down and adjust lumba down becaise there is only one relay for that motor.Thank you.
This video is perfect. I was trying to learn how relays can be used for various applications and I was stuck on how to build a reverse polarity system. In some circuit designs, this is similar to an "H Bridge," using MOSFETs -- but not exactly. Thanks again.
Very good easy to follow explanation thank you
Well done sir thanks for sharing. Flipping awesome.
Your Welcome, Glad this could help
I've watched 8 or so other videos on UA-cam about this and they all did not correctly represent what was supposed to happen.
not only did I replicate what you did, I was able to understand where the others went wrong, job well done Sir
i thank you sooooo much this video help me out of a jam and made life easier for me🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥
Thank you this really good to refer to when making those special projects!
Glad it was helpful!
@@hotrod-machines hello sir can i run may bike self starter and horn by same switch by use of a relay if yes will u please help me
@@arorajdk5438 You'll need to explain better what you are trying to do.
@@hotrod-machines sir actually there is video on UA-cam 5 year ago ..in this video a men turn his bike ignition on and push start button bike started and again when hi push start button this time it works for horn (as a horn switch) after turn ignition off by key he repeated the process ( 1st time push button work for bike start and after that it works for horn untill we didn't turn off the ignition by key ) and he did it with the help of relay
@@hotrod-machines sorry for my english don't know i explain correctly or not
I'm going to try 2 trimpots and see if that will work on a dc motor. If not I'll get the relays.
Awesome vid, thanks.
You’re awesome! Enjoyed the video!!
Glad you enjoyed it!
AWESOME,,CHEERS MATE WORKED WELL OM MY ROV MOTORS
AHA! Finally got there thanks to the diagram and detailed overview......installing a set of full electric AMG seats without control switches into my ford transit...The DPDT method is less troublesome and the twin relays are perfect! thanks again...
AMG seat in a transit van, haven't seen that one. I know lots of guys who do the Toyota sienna seats with the foot rest. Would love to know what seats you used and why?
Seats from a 2006 Mercedes SUV...only minor mods to fit transit base
Remember this can be used for any case where you need to reverse the polarity of your 12V wires to run a motor, actuator, winch, windows door locks or other devices. You can also change the amperage to suit your needs. The benefit of this approach is that it allows you to control the devices with a low voltage switch and still have high amperage output to your device.
Yes sir I'm using it for a fuel switching valve and aux fuel tank
Hi, I have two Motors. One for left track another for right. I Also bought 4 5 Pins relays. So I Just need two spdt switches, each for one motor. therefore, I can independently drive the vehicle forwards or backwards or turn left or right when one motor is switched off with the switch. i.e. one switch for one motor, forward, reverse or stop.
Hotrdd machines i think this has to be the best tutorial vid of explains how to wire up relays direct and to the point . my predicament is to try n make a long story short im rewiring my hot rod that has the factory power windows and only using the front windows so i decided id buy a two window switch 80s gm style like that came in the c 10 trucks my old ford pwr windows utilize 4 wires black to ground green red and yellow to power up the windows up or down only applying battery power it requires me to use the green and yellow to positive or red and green to positive for up and down i cant seem to configure whats needed and thought maybe i need relays but cant find the rt sequence to make it happy any ideas ?
Do you have a link to some pictures of the switches? How many wires come out of the switches? I would assume that a proper switch will replace a relay. You probably don’t need relays.
Awesome video and nicely explained.I am trying to add a second passenger electric window switch to the drivers door and thanks to you I now know I need 2 5 pin relays but I still cannot get the switches to work independently,as with both connected ,neither work.Any ideas ?Thanks
Do you have a diagram of how you currently have them wired up? Also are you using + or Neg. power from the switch to trigger the relays?
@@hotrod-machines Thank you for replying and for trying to assist.Problem here is ,not sure if I need relays or just a connection from the passenger switch.I have the original passenger switch with 4 pins, being ground ,+12v and 2 middle pins from the window motor.These 2 pins always have continuity from ground and when the switch is pressed they get +12v individually to move window up and down.Now ,what I have done is bought another switch exactly the same for the drivers door and simply pulled 2 wires from the passenger side and connected to the 2 motor pins .This switch then gets ground and +12v from the drivers switch .So I have 2 switches wired and connected exatcly the same and I am aware that having both connected ,when pressed +12v doesnt go to the pins.Think the problem is having the motor wires connected to the same pins on both switches ,so maybe I need to connect these differently or use relays ,not sure.
Meanwhile ,I bought an aftermarket available kit specifically for the car mainly to try and find out how they done it,but I more than welcome an experts opinion on this and hope I managed to explain it clearly.Cheers
@@powerspeedutube Without a wiring diagram it is pretty hard to help. Can you draw it up?
@@hotrod-machines
Hi,how do I send you a diagram ?I have worked it out but only using 2x Mini Songle SPDT SRA-12VDC-CL .Still cannot do it with " standard " 5 pin spdt.Would love to know how .I will draw up a diagram and please tell me how I can send it to you or I just simply put up a link here to my Google Drive?Cheers
First
You shouldn't call them 5 pin relays. They are SPDT relays Bosch style. Calling them 5 pin might get you the wrong ones when you go to buy them. Some 5 Pin relays are actually Single pole Single throw. Where pins 87 and what looks to be 87a is just another 87 no "a". So you need to check that first.
Second. Getting a wiring diagram would help a great deal. if you have Word, Power Point or better yet Visio, you can make a crude diagram just add pictures and lines with descriptions and from there we can redo it to make sure we understand you.
Third. Need as much information as possible in list format. a. Make model year of car. b. is the power windows original to the car. ect ect. Post pix of the switches and and any other parts you have.
Fourth. Post in google drive. Once a connection is made through there direct emails can be used or even phone calls.
Are you sure it is a four pin switch? I have never seen a 4 pin switch that wasn't harnessed to a control board. The control board is what does what it is named for. Control. These are not direct wired to the motors. So I am very confused by your information. Like why are you trying to put Bosch style relays in and trying to figure them out when/if the car already had power windows. It should already be wired up with relays or control system.
Last. You shouldn't be running the motor wire to the driver side. Best guess (without much information) that you need to run wires from switch to switch. Parallel connection to the non grounded pins.
Is there a way to make a linear actuator move on a 12v power and then return back in when the power is taken away from that added 12v
Have you looked at this video? ua-cam.com/video/MMvtU5e0lB8/v-deo.html The challenge is that your actuator must have stops built into it because the power will always be trying to make it go up or down.
I have installed a complete painless harness in my caprice. I have 2 power windows. I have 1 wire from the fuse box which is 20 amp fused..is that enough to control both windows simultaneously without blowing the fuse using this diagram? They are factory window motors not sure the amperage
I'm pretty sure there is no way your power windows would use 20amps. Most cars would be 10-15amps for all the windows. However you can always look on the motors or do some research to find out.
Just out of curioseti is it posibel to combine more types of relays? Exampel can I use an 3 pin blinker relay like some sort of programabel timer to use 4 5 pin relay? Or perhaps some how use the wiper motor relay ya know jzst to make things litel bitt more interesting. I tought long if it might by posibel to make animal guard with an blinker relay and ignition coil . Was also curiuse wuld it by posibel to reverse direction on an 6 pin wiper motor direction?
Well anything is possible. But you should just install a double pull switch and the third wire. It would make life much simpler.
I used your scheme. I have four 24v 40 A relays and two powerful electric motors. I used two spdt relays for each motor and followed your schematic. However, I am wondering in which part of the schematic do I need thicker cables for a current up to 40A and where exactly do I place the 40A fuse in your schematic to protect the cables from overloading. thanks for the reply.
That's a great question, and I should have specified it in the video. The 40 Amps from the battery goes to pin #87 and out Pin #30 to the motor. So you could actually fuse it at the battery before pin #87 to protect the relay and motor and possibly even a fuse between pin #30 and the motor if you are concerned that a short might come backwards. Personally I have mine fused before pin #87.
You will also want "Heavy" + wire from the battery to #87 and from #30 to the motor. But don't forget a heavy "return" ground wire as well. That goes from battery to #87A. Basically you need heavy wire every where except from your switches and to #85 and #86 as those just power the magnetic coil in the relay.
@@hotrod-machines Thanks for the reply. It's clear to me now. However, I noticed that the otherwise strong and heavy {12lbs} 24V electric motor from the wheelchair has a red and black wire coming out of it that is only 12 gauge, so I will only be able to use fuses up to 20A? This seems very little to me, I would prefer 30A or even 40A. So I'm left with only being able to draw 20A from the motor if I go for safety vs. power. Because I'm sure I could draw 50A from one motor for a minute or so without consequences for the wires?
@@zoba4645 You could always install a thermal breaker / fuse, or upgrade the wire?
@@hotrod-machines hi, if I would use 4 pin relay, what will be the difference in wiring scheme versus 5 Pin relay? Thanks
Wuld that methode work if I wuld like to change polarity on my ignition coil? Im meaning waste spark ignition wuld it do the same thing? How wuld dual trigers look like for exampel dual 4 pin gm ignition modules?
I'm confused. So if I understand this correctly you want to switch the polarity of the ignition coil when you flick a switch? May I ask why?
hi, good video. but where do you put the ignition switch on this wire diagram??
Ignition is usually + power so in this example you would find a fused ignition source and run that to the middle pins on the relay, where 85 and 86 are connected. This video doesn’t go into fusing your power sources but they should all be properly fused. If you want the relays to come on when you turn the ignition on then you would permanently ground outside pins 86 & 85 and power the inside, middle pins 85 & 86 when the ignition comes on.
@@hotrod-machines ok. thanks. if you have time to send me a drawing of this? so I can understand it better? that would have been kind of you.
but will not ignition system be on when you connect it to battery ??
@@MrSolbrekke What is it you are trying to control and how did you want it to work? The video above is used to control a DC motor to go either forward or reverse using a switch. If you want to use a switch but only when the ignition key is on then battery + power goes to both 87 pins and the + middle 85 & 86 pins would get + power from the ignition.
If you look at the video, at the 9:06 mark there is a diagram. If you see the red + line going to pins 85 & 86 those are the ones you would connect to your ignition instead of the battery. That would make it so that the switch would only work when the power is on.
@@hotrod-machines Thank you very much, then I understand.
Great video, hope you are well. Can you help me figure this out? Id like to use a single throw rocker switch and have it light up a bulb on 2 different filaments (say high/low) going in this sequence:
Off-off
Off-on
Then switch filaments and go
Off-off
Off-on
Like switch it once and it’s in low, switch it twice and it’s in high. Never having both on at the same time
@@josephcuevas7318 Sorry I am not sure I understand what you are trying to do. The relays above are designed to alternate the polarity of two wires going to a device. If your light has a Negative post and two positive posts, or something like that it may be possible. How does the light determine whether its in low or high?
@@hotrod-machines it’s an 1157 bulb, I want to be able to use 1 single throw rocker switch to switch between the 2 side of the light. How some flashlights are able to switch between brightness by pressing the button multiple times
@@josephcuevas7318 Without an electronic circuit you can not do this with a SPST switch, you would need a DPDT switch to select between low and high. You are trying to use the relays to perform logic.
@@hotrod-machines ok, do you know if there is a premade circuit I can wire inline to make the single throw rocker switch work?
Where can I get high quality relays? When powering a 40amp device, do all wires need to be a thick gauge.
Sorry I don't have a location for you to order from. Also the wire size will depend on a lot of other factors as well. For example the distance and the duration of how long you need 40 Amps and at what voltage.
This is gonna be used for a convertible top pump in a vehicle. Probably 10 to 12 ft length of wire, duration would be about a minute.
@@appleparts5365 First take another look at your load. 40 Amps is pretty high, or do you mean 40 watts? Use the 80% rule, so if you have 40 amps multiply it by 1.25 to get 50, and get a wire size for 50 Amps. Then jump on google and find one of the chart that will give you wire size. At 12 feet you shouldn't have to do any upsizing of the wire. A quick looks shows 6 AWG but you need to run the numbers yourself.
learnmetrics.com/12v-wire-size-calculator-chart/#:~:text=In%20practice%2C%20we%20use%20wires,as%20well%20as%20the%20battery).
I'm connecting 4 linear actuators in parallel so all get controlled by the same switch. I have a dpdt switch already but i don't want to run thick wires all the way to the switch because total amperage of actuators is 32A. Can I use this method to allow me to run thinner wires to the switch and use the switch to just trigger the relays and have the high current go through the relays instead of the switch?
Do you have a wiring diagram Im trying to operate a car electric seat well 2 seats the motors working but all the wiring was cut out many thanks
There is a wiring diagram in the video that shows you how to wire everything up.
I cant get my head around this, when I wire this up, both relay coils have current going over them. Before long, they heat up. What am i doing wrong here?
Nevermind, I worked it out. If anyone else stumbles across this with the same problem, my central locking system must be positively switched (not neg switch) so the two constant 12v positive feeds to the coil needed to be replaced with 12v negative feeds.
If they are getting hot make the two hot leads negative leads. It’s probably a positive ground system .
Edit. Sorry. Didn’t see your feedback to yourself , lol. Bravo though. Systems are tricky at times
Hi. Question... so I have an actuator that I want to.keep closed whole my vehicle is turned on. However I want the actuator to open if I press on my car brakes. Is there a way to wire this using relays? Please and thank you.
When you say "actuator" what do you mean? Do you have a link or can you explain how its normally wired and what the function is?
@@hotrod-machines hello, thanks for responding it's just a regular actuator with 2 wires, + & -, to extend you provide power to + & ground the -. If you want it to close I have to swap the ground and power. Just an arm that extends and closes. Does that make sense?
@@TheSocialPraxis The short answer is it will work. BUT unless you have a limit switch built into the system it will not work properly. What I mean is that there are basically three states in the video above. STATE # 1 might be motor UP, STATE #2 is motor DOWN and STATE # 3 is DO NOTHING. Your brake lights only have OFF and ON, and therefor can only trigger TWO STATES, You could wire it so that when you hit the brakes the actuator goes UP and then when you release the brake the actuator goes down. But once the actuator hits the bottom what stops it from trying to keep going?
If your actuator has limit switches built in to stop it then just go to the rear lights and figure out which wire is the trigger. Is it + or negative sent by the press of the brake pedal. I'd assume ground Neg - ???
@@hotrod-machines using one of those tools that beeps when I touch a hot wire, I was able to find the brake wire + when pressed. I believe they have built in switches to stop cause hear any buzzing or anything after they're down/up.
@@TheSocialPraxis You can follow the video above then. But instead of using the ground - to trigger the relay use the + wire. That means the relay will always have ground and when you hit the positive it will switch the relay. You are going to need to change the wiring on the relay so that both relays trigger when you hit the brakes. You then need to switch the wires on 87 & 87A on one relay. This means when the relays are energized they will always be sending power to the actuator, either up or down. Just watch the video a few times and once you understand that two of the relay wires open and close the relay, one wire is the output from the relay and the other two are the inputs. Please make sure you FUSE this. Because this will blow a fuse if only one relay triggers
will I need two power supply? one for the actuator and one to exit the coils? Some1 plz help me out
No this can all be done from the same battery or power supply as long as the power supply has enough Amps to run what you want.
@@hotrod-machines also where do I place the fly back diodes ?
@@talhaamir7387 What are you trying to do? There are now fly back diodes in my wiring.
What you have really isn’t a DPDT relay. A true DPDT relay is less flexible as you have only one control input and both outputs move together. Using two separate relays gives you two coils to actuate rather than one and allows you more flexible as you can also have an “off” position.
Can this work on AC circuits?
The same wiring and principals apply to AC, but you MUST use AC relays rated for the AC voltages and amps
BTW you can’t use this method to reverse an AC motor.
Hmm....I thought I had the electrics sorted but something does not seem right.....the wiring diagram is a bit confusing as it seems that neg and pos wires are being strung together as the mass of wires makes it difficult to see what goes where.....I'll keep trying
Follow the diagram at the 9min mark. Follow the coloured line and when you see a "bump" going over another line that means they are NOT connected. If two lines meet and there is no bump they are connected.
why not use an electric window switch?
You could use a DPDT switch for low current motors, but the intent of this video is to give users access to relays that are good for 40+ amps of current and run much larger motors.
0:41 "which is kind of special order" NO. No it is not. Using two single pole double throw relays to reverse polarity has been around since there were motors and relays.
0:41 "i'm going to wire up these single pole double throw relays so that they do the exact same thing as a double" Um No. You are NOT doing the exact same thing. If you were energizing both relays at the same time, THEN you would be close to the exact same thing. Doing it this way adds the ability to stop the motor at any given position. You can't do that just using a DPDT relay.
FYI on amazon you can find a harness to do this exact thing with. It is pre wired. Very inexpensive.
Appreciate your thoughts but some of us live in parts of the world where electronics stores and Amazon are not easily accessible. At the time of this video I had access to basic hardware and automotive stores, and these were relays that you can get at almost all of these stores.
@@hotrod-machines Yes that why I put FYI For Your Information. Generally meant as giving information for future use, or something to think about or even look into. It is not meant to be a "You don't know what you are doing you should have just use this or that".
And if amazon is not accessible then just disregard.
Also where do you live that you don't have access to amazon. WOW. I wasn't addressing the entire world just you. LOL. I made an assumption that if you have access to youtube to make and upload videos, I was sure you had access to amazon. You know they deliver?
Not tryin to bust balls here but.....