This was the final puzzle piece needed for my DIY self-charging fuelless electric portable generator. Basically-starting the electric motor with the battery, running it up to 3600 rpms and then switching to the dc power that the generator is producing and in turn being able to self run the generator and charge the battery at the same time. Many thanks, just what I needed!
Excellent explanation! Thanks! Is it possible to use a relay to a switch and dome light to wire up puddle lights that will turn on with dome and a switch?
Hmm, it depends on the type of vehicle. Most that I've seen have a dimming feature on the bulb, which wouldn't work well with the relay. I don't think it would damage the vehicle, but the relay would act strange as the relay "dims" instead of the bulb
What happens if power goes to both 87 and 87a at the same time? Will it short out? I have a light up emblem that is connected to my headlights but I want a separate trigger. But God forbid I accidentally flip the switch when the headlights are already on
It won't short anything out. You will always have power going to whatever is connected to 30. If you imagine hardwiring everything without a relay, but you just named your wires 87a, 87 and 30..then you would have wire 87a twisted to wire 30 at one point and then wire 87 twisted to wire 30 at another point. Inside the relay the same thing is happening.
Trying to use my uptfitter switches on my truck to turn on and off some LED auxiliary lights that I want to install to my trailer, but I would like to connect it to the 7 pin connector for the reverse lights and also be able to turn them on with the upfitter switch in my truck and another switch by the trailer hitch. Can you draw me a diagram I can use for this procedure? Or would this 5 pin relay do the trick?
How can I connect led lights in my car to come on when I unlock the car with my dome light and also be able to turn on with the fog lights as well?? Can I use this set up with a fog light tap running to 87a and dome lights connected to 85? So when the car is unlocked they come on with the dome lights but when I turn on the fog switch 87a comes on.... am I going right?
so I'm renovating a school bus into an RV and there's exterior lights as well as interior lights that I want to have on the buses normal running power but also wired to a battery bank for when the bus is turned off I'm assuming this would probably be the best way to go?
can you do a video of how to use a relay to control a 3 wire solenoid that has a ground , a pull and then a hold wire and drops the pull wire but conts. to hold on the hold wire until the 12 pos is no longer there from the signal wire
This is interesting. Have I wired my relay wrong. I used 85 for ground trigger 86 and 30 are tied together to fused battery 87 is power out to fan+ and fans- to ground 87a is unused. I only ask because I have been running like this for months no problems but recently one fan is blowing fuse and I notice relay getting hot and so is the relay pigtail harness. Fan wires seem fine. I might try wiring mine like this instead.
@@LegitRaceCraft no relays are 40 amp. I replaced fans and upgraded fan power and grounds to 10ga. So far so good. I assume the fans were going bad causing a b i g draw
The heat comes from resistance somewhere. Since your relay can handle the amps, I would look for a loose connection near where the heat is. Flipping pins 87 and 30 won't change anything.
Hello men ,i want to do switch or relay in my laptop, between normal supply and integred battery. The purporse is when im in normal supply i can choice that battery charge or not. Can you help
I have 5 pin relays, meant to get 4 pin because I understand them better...does 87a have to he used or can I treat it as a 4 pin relay? I've tried to wire it up, but could not get it to work let's say I'm using it for a fuel pump.
The easiest way is to look at a wiring schematic of your vehicle. The cooling system diagram will show the relay. And the two wires connecting to the coil portion of the relay will show one wire connected to the ECU and the other wire connected to either ground or the battery. So if it's a positive connection on the non-ECU side (most likely) then you'll have a ground connection on the ECU side. Don't connect a multimeter to the relay connections, specifically the relay connections that connect to the coil. I learned in school that this can send unwanted voltages to the ECU and potentially damage it.
Having to add external voltage regulator 98 2500 12 valve b it's attached to fire wall is that my ground for unit the pcm isn't exciting altinator buy two field wires after thearing into every harness I no issues with been and blue but bad grounds smashed under main batt box fixed them truck runs better no charge day time I'm fine or when it's cold fuel heater plug sheared off and after all that tearing my dash off and into peices I have a spot in PDC for a 30 amp right on main bracket I just need to know if it's a spice into acc plug in emptied spot or something else
I have a 5 pin relay question for you! I want to wire auxiliary backup lights to my truck. I want them to be powered two ways. 1st signal off of reverse lights so they come on automatically when in reverse. 2nd off of a toggle switch so they can be used as work lights. But I don't want to back feed power into the factory backup lights. Is this possible with a 5 pin relay? If not do you have any suggestions. Thanks for your time
If you connect 87a to the default reverse light trigger and 87 to the manual switch then all of the load from your aux lights will be put on your reverse light system and possibly blow a fuse. There's not a way to do this with one relay that I can think of. You'll have to use two relays, and I've laid it out for you below. Draw this out on paper so that it makes sense. Primary relay: 30: to fused power 85: to ground 86: reverse light positive tap 87: to secondary relay pin 87a Secondary relay: 30: aux lights 85: to ground toggle switch 86: to fused power 87: to fused power 87a: to primary relay pin 87
@@LegitRaceCraft you had me all the way up to the secondary relay #'s 85, 86 & 87. Does 85 go to the toggle switch? Positive? 86 ? 87 ? Which one goes to the positive of the lights? Which one is to ground?
For the secondary relay, if your toggle switch is a ground toggle switch then 85 is what the ground toggle will connect to and 86 will be your fused power from the battery, if you have a positive toggle switch then connect it to 86 and 85 will be straight to ground. Pins 85 and 86 don't require large wires, they can be small since they only power a small electromagnet in the relay. Pin 87 is a larger wire that comes from the battery and is fused. This is the power feed. Pin 30 connect to the positive of your auxiliary lights
So I'm trying to use this method to run some LEDs. I want to power them using my curtesy lights on my car and be able to use a latching led halo switch. Any suggestions? I've tried this method once and couldn't get the relay to throw, what could I be doing wrong?
Chris did you figure this out? Id like to connect led lights in my car to come on when I unlock the car with my dome light and also be able to turn em on with the fog lights as well
+Kyle Vanwinkle no, that will work. I might draw up some more diagram videos if I have about 5 examples to use. That's a good one to use in an example though. What are you using it for?
HourNine Racecraft I'm going to add it to my 7 pin trailer wire circuit. The center pin is an auxiliary pin factory it is wired to the reverse circuit. I want to add a switch to energize that pin when the vehicle is not in reverse without backfeeding the reverse circuit. I'll be using the circuit to energize some rock lights on my rv for when I have to turn tight near a ditch at night. I can watch my tires so I don't drag my trailer into a ditch
can you use a 5 pin relay to connect a RGB LED strip for a snowmobile...87a (NC) giving the power to the whole LED while the (NO) side being activated by the brake handle that will then just activate the RED LEDS on the LED strip??? Thx for the help and vids are very informative.
yeah.. that should work as long as the LED is wired with the right polarity. you would need another off switch though, since the LED would always be on
my question is how do I wire this to work and not have a constant bleed over of the RED LED being constantly on since it is a ground based circuit...thx again
If it is like a typical RGB LED then you will have one negative and three positive. So the two positive should go to pins 87a and 87, and your power feel would go to pin 30. When the relay is switched on it will light up the wire from pin 87, and when it is in the off state it shine through pin 87a until the ground circuit is killed.
additional led back up light but also be able to switch on manually when needing the light while working not actually backing up. simply replace the fan in your video for a light. 87a comes from the reverse back up light power 87 comes from the battery via a switch being flipped without needing the vehicle to be running and or in reverse, with a fuse :) am i thinking this through correctly??
87a is connected directly to pin 30 before the relay is turned on through pin 85. So you will always have power to 87a until the relay is turned on and then 87 will have power
This was the final puzzle piece needed for my DIY self-charging fuelless electric portable generator. Basically-starting the electric motor with the battery, running it up to 3600 rpms and then switching to the dc power that the generator is producing and in turn being able to self run the generator and charge the battery at the same time. Many thanks, just what I needed!
Excellent explanation! Thanks! Is it possible to use a relay to a switch and dome light to wire up puddle lights that will turn on with dome and a switch?
Hmm, it depends on the type of vehicle. Most that I've seen have a dimming feature on the bulb, which wouldn't work well with the relay. I don't think it would damage the vehicle, but the relay would act strange as the relay "dims" instead of the bulb
What happens if power goes to both 87 and 87a at the same time? Will it short out?
I have a light up emblem that is connected to my headlights but I want a separate trigger. But God forbid I accidentally flip the switch when the headlights are already on
It won't short anything out. You will always have power going to whatever is connected to 30. If you imagine hardwiring everything without a relay, but you just named your wires 87a, 87 and 30..then you would have wire 87a twisted to wire 30 at one point and then wire 87 twisted to wire 30 at another point. Inside the relay the same thing is happening.
HourNine Racecraft thank you!!
Trying to use my uptfitter switches on my truck to turn on and off some LED auxiliary lights that I want to install to my trailer, but I would like to connect it to the 7 pin connector for the reverse lights and also be able to turn them on with the upfitter switch in my truck and another switch by the trailer hitch. Can you draw me a diagram I can use for this procedure? Or would this 5 pin relay do the trick?
I can't say I'm familiar with the uptfitter switches
How can I connect led lights in my car to come on when I unlock the car with my dome light and also be able to turn on with the fog lights as well??
Can I use this set up with a fog light tap running to 87a and dome lights connected to 85?
So when the car is unlocked they come on with the dome lights but when I turn on the fog switch 87a comes on.... am I going right?
This is exactly what I was looking for 👍
so I'm renovating a school bus into an RV and there's exterior lights as well as interior lights that I want to have on the buses normal running power but also wired to a battery bank for when the bus is turned off I'm assuming this would probably be the best way to go?
Yeah, it's probably the simplest way
Very helpful. Thanks for sharing your video tutorial on this relay diagram.
Super 👌 thank you for making this video.
can you do a video of how to use a relay to control a 3 wire solenoid that has a ground , a pull and then a hold wire and drops the pull wire but conts. to hold on the hold wire until the 12 pos is no longer there from the signal wire
This is interesting. Have I wired my relay wrong. I used 85 for ground trigger 86 and 30 are tied together to fused battery 87 is power out to fan+ and fans- to ground 87a is unused. I only ask because I have been running like this for months no problems but recently one fan is blowing fuse and I notice relay getting hot and so is the relay pigtail harness. Fan wires seem fine. I might try wiring mine like this instead.
Are you exceeding the amp rating of your relay?
@@LegitRaceCraft no relays are 40 amp. I replaced fans and upgraded fan power and grounds to 10ga. So far so good. I assume the fans were going bad causing a b i g draw
The heat comes from resistance somewhere. Since your relay can handle the amps, I would look for a loose connection near where the heat is. Flipping pins 87 and 30 won't change anything.
Hello men ,i want to do switch or relay in my laptop, between normal supply and integred battery. The purporse is when im in normal supply i can choice that battery charge or not. Can you help
I have 5 pin relays, meant to get 4 pin because I understand them better...does 87a have to he used or can I treat it as a 4 pin relay?
I've tried to wire it up, but could not get it to work let's say I'm using it for a fuel pump.
Actually, I have a link in the description that covers this exact question..lol. basically, treat it the same.
Cool thank you!
How do you test to determine if your factory fan is positive triggered or ground triggered with factory relay?
The easiest way is to look at a wiring schematic of your vehicle. The cooling system diagram will show the relay. And the two wires connecting to the coil portion of the relay will show one wire connected to the ECU and the other wire connected to either ground or the battery. So if it's a positive connection on the non-ECU side (most likely) then you'll have a ground connection on the ECU side. Don't connect a multimeter to the relay connections, specifically the relay connections that connect to the coil. I learned in school that this can send unwanted voltages to the ECU and potentially damage it.
Having to add external voltage regulator 98 2500 12 valve b it's attached to fire wall is that my ground for unit the pcm isn't exciting altinator buy two field wires after thearing into every harness I no issues with been and blue but bad grounds smashed under main batt box fixed them truck runs better no charge day time I'm fine or when it's cold fuel heater plug sheared off and after all that tearing my dash off and into peices I have a spot in PDC for a 30 amp right on main bracket I just need to know if it's a spice into acc plug in emptied spot or something else
I have a 5 pin relay question for you!
I want to wire auxiliary backup lights to my truck. I want them to be powered two ways.
1st signal off of reverse lights so they come on automatically when in reverse. 2nd off of a toggle switch so they can be used as work lights. But I don't want to back feed power into the factory backup lights.
Is this possible with a 5 pin relay? If not do you have any suggestions.
Thanks for your time
I should be able to 87a for the default reverse light trigger and 87 for the manual switch trigger to turn the lights on?
If you connect 87a to the default reverse light trigger and 87 to the manual switch then all of the load from your aux lights will be put on your reverse light system and possibly blow a fuse. There's not a way to do this with one relay that I can think of.
You'll have to use two relays, and I've laid it out for you below. Draw this out on paper so that it makes sense.
Primary relay:
30: to fused power
85: to ground
86: reverse light positive tap
87: to secondary relay pin 87a
Secondary relay:
30: aux lights
85: to ground toggle switch
86: to fused power
87: to fused power
87a: to primary relay pin 87
@@LegitRaceCraft thank you. I'm going to draw it out now.
@@LegitRaceCraft you had me all the way up to the secondary relay #'s 85, 86 & 87.
Does 85 go to the toggle switch? Positive?
86 ?
87 ?
Which one goes to the positive of the lights?
Which one is to ground?
For the secondary relay, if your toggle switch is a ground toggle switch then 85 is what the ground toggle will connect to and 86 will be your fused power from the battery, if you have a positive toggle switch then connect it to 86 and 85 will be straight to ground. Pins 85 and 86 don't require large wires, they can be small since they only power a small electromagnet in the relay.
Pin 87 is a larger wire that comes from the battery and is fused. This is the power feed. Pin 30 connect to the positive of your auxiliary lights
So I'm trying to use this method to run some LEDs. I want to power them using my curtesy lights on my car and be able to use a latching led halo switch. Any suggestions? I've tried this method once and couldn't get the relay to throw, what could I be doing wrong?
Chris did you figure this out?
Id like to connect led lights in my car to come on when I unlock the car with my dome light and also be able to turn em on with the fog lights as well
Could pin 85 and 87 both be fed buy another switched relay or will that mess with the 87a circuit causing it to not latch
+Kyle Vanwinkle no, that will work. I might draw up some more diagram videos if I have about 5 examples to use. That's a good one to use in an example though. What are you using it for?
HourNine Racecraft I'm going to add it to my 7 pin trailer wire circuit. The center pin is an auxiliary pin factory it is wired to the reverse circuit. I want to add a switch to energize that pin when the vehicle is not in reverse without backfeeding the reverse circuit. I'll be using the circuit to energize some rock lights on my rv for when I have to turn tight near a ditch at night. I can watch my tires so I don't drag my trailer into a ditch
+Kyle Vanwinkle sounds like it will work, I don't see why it wouldn't
can you use a 5 pin relay to connect a RGB LED strip for a snowmobile...87a (NC) giving the power to the whole LED while the (NO) side being activated by the brake handle that will then just activate the RED LEDS on the LED strip??? Thx for the help and vids are very informative.
yeah.. that should work as long as the LED is wired with the right polarity. you would need another off switch though, since the LED would always be on
negative circuit system main on is via the IR multi color remote and the RED would be the brake circuit...just have been unable to wire it correctly
my question is how do I wire this to work and not have a constant bleed over of the RED LED being constantly on since it is a ground based circuit...thx again
If it is like a typical RGB LED then you will have one negative and three positive. So the two positive should go to pins 87a and 87, and your power feel would go to pin 30. When the relay is switched on it will light up the wire from pin 87, and when it is in the off state it shine through pin 87a until the ground circuit is killed.
actually it is the opposite...you have the white wre which is your common and the RBG are all the negative or ground wires...hence my dilemma
additional led back up light but also be able to switch on manually when needing the light while working not actually backing up. simply replace the fan in your video for a light.
87a comes from the reverse back up light power
87 comes from the battery via a switch being flipped without needing the vehicle to be running and or in reverse, with a fuse :)
am i thinking this through correctly??
Good explanation👍
What if your getting the power to 87a and then you turn the switch connected to 85 on
87a is connected directly to pin 30 before the relay is turned on through pin 85. So you will always have power to 87a until the relay is turned on and then 87 will have power
thanks...have solved my problem
Thanks🐶