Switch????
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Teching In
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From: Toms River, NJ
Switch???? What kind of switch is a temporary switch? I want to be able to turn on a 12v switch inside a vehicle but then be able to turn the accessory off in the rear and have the switch reset by it self once the vehicle is shut off?
Let me know if I have to explain better.
Thanks
Let me know if I have to explain better.
Thanks
Joined: Nov 2003
Posts: 11,321
Likes: 341
From: Jacksonville, FL (originally from Toronto Canada)
Originally Posted by Trans AM Scotto
What kind of switch is a temporary switch? I want to be able to turn on a 12v switch inside a vehicle but then be able to turn the accessory off in the rear and have the switch reset by it self once the vehicle is shut off?
Let me know if I have to explain better.
Thanks
Let me know if I have to explain better.
Thanks
The rear defogger is an example of this type of setup (although it also has a timed shutoff). You press the button once and the defogger turns on and stays on even though you released the button. Press the button again and the defogger shuts off. Or, turn off the ignition and the defogger shuts off as well.
Joined: Nov 2003
Posts: 11,321
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From: Jacksonville, FL (originally from Toronto Canada)
You can easily make your own latching relay using an ordinary automotive 30-amp relay and a diode.
In your case you would change the "constant power" at terminal 30 to an ignition controlled power source. That way the relay would reset when you shut off the ignition.
The way it works is that the positive pulse on terminal 85 (from your switch) trips the relay and allows current to flow from terminal 30 thru terminal 87 to your accessory. Once the relay has been tripped, a small portion of the current also flows through the diode from terminal 87 to terminal 85, keeping the relay coil energized and the relay closed. The two ways to turn the circuit off once it's tripped are to interrupt the ground for the relay coil (as shown with the separate reset switch connected to terminal 86) or interrupt the power supply going to terminal 30 (by turning of the ignition).
In your case you would change the "constant power" at terminal 30 to an ignition controlled power source. That way the relay would reset when you shut off the ignition.
The way it works is that the positive pulse on terminal 85 (from your switch) trips the relay and allows current to flow from terminal 30 thru terminal 87 to your accessory. Once the relay has been tripped, a small portion of the current also flows through the diode from terminal 87 to terminal 85, keeping the relay coil energized and the relay closed. The two ways to turn the circuit off once it's tripped are to interrupt the ground for the relay coil (as shown with the separate reset switch connected to terminal 86) or interrupt the power supply going to terminal 30 (by turning of the ignition).
Thread Starter
Teching In
Joined: Jan 2003
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From: Toms River, NJ
Hey, I have not tryed the relay out yet, but have two more questions
Can there be a constant 12volts going to 85 without burning up the relay or does it have to be just a pulse?
What diode should be used? How do you determine it?
Thanks Again
Can there be a constant 12volts going to 85 without burning up the relay or does it have to be just a pulse?
What diode should be used? How do you determine it?
Thanks Again
Joined: Nov 2003
Posts: 11,321
Likes: 341
From: Jacksonville, FL (originally from Toronto Canada)
Originally Posted by Trans AM Scotto
Hey, I have not tryed the relay out yet, but have two more questions
Can there be a constant 12volts going to 85 without burning up the relay or does it have to be just a pulse?
What diode should be used? How do you determine it?
Thanks Again
Can there be a constant 12volts going to 85 without burning up the relay or does it have to be just a pulse?
What diode should be used? How do you determine it?
Thanks Again
You can pick up a 1-amp or 2-amp diode at Radio Shack or any electronics store. It doesn't really matter which one you use.
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Thread Starter
Teching In
Joined: Jan 2003
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From: Toms River, NJ
Just started to work on the relay but I don't think that it is working proper. I have 87 going to a light and going to a ground. 30 has a constant 12v. 85 has 12v momentary and 86 has momentary.
The only way the light works is if I hold down the ground momentary and then press the one on 85 in. When 86 ground is release it goes out.
Is this correct or is it not working properly?
Maybe it would be easier to say, what do I have to do to have a 12v acc. be turned on and off by a 12v pulse. This way I can just run 2 12v momentary switch. Is this possible?
The only way the light works is if I hold down the ground momentary and then press the one on 85 in. When 86 ground is release it goes out.
Is this correct or is it not working properly?
Maybe it would be easier to say, what do I have to do to have a 12v acc. be turned on and off by a 12v pulse. This way I can just run 2 12v momentary switch. Is this possible?
Last edited by Trans AM Scotto; Mar 29, 2007 at 09:39 PM.
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Verdad Gallardo Joined: Nov 2003
Posts: 11,321
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From: Jacksonville, FL (originally from Toronto Canada)
Originally Posted by Trans AM Scotto
Just started to work on the relay but I don't think that it is working proper. I have 87 going to a light and going to a ground. 30 has a constant 12v. 85 has 12v momentary and 86 has momentary.
The only way the light works is if I hold down the ground momentary and then press the one on 85 in. When 86 ground is release it goes out.
Is this correct or is it not working properly?
Maybe it would be easier to say, what do I have to do to have a 12v acc. be turned on and off by a 12v pulse. This way I can just run 2 12v momentary switch. Is this possible?
The only way the light works is if I hold down the ground momentary and then press the one on 85 in. When 86 ground is release it goes out.
Is this correct or is it not working properly?
Maybe it would be easier to say, what do I have to do to have a 12v acc. be turned on and off by a 12v pulse. This way I can just run 2 12v momentary switch. Is this possible?
Thread Starter
Teching In
Joined: Jan 2003
Posts: 47
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From: Toms River, NJ
Ok, so I just need to get a momentary that stays closed, for the ground side. Think I can manage that.
What about the have the accessory turned on and off by the same 12volt pulse.
Do you know of any site that I can read up on some 12volt stuff. I have been to the the12volt.com, but that is mainly audio and alarms.
Thanks again
What about the have the accessory turned on and off by the same 12volt pulse.
Do you know of any site that I can read up on some 12volt stuff. I have been to the the12volt.com, but that is mainly audio and alarms.
Thanks again
Joined: Nov 2003
Posts: 11,321
Likes: 341
From: Jacksonville, FL (originally from Toronto Canada)
No, you can't have a latching relay turn off using the same momentary switch that provides the 12V pulse to start it. Once the relay is latched it is receiving power through the diode to keep it active so adding another power pulse won't affect anything.
It would be helpful if you could give some more details about what you're trying to connect. For example, it might be possible to wire a two-way momentary switch (like a factory convertible top switch) to both activate and deactivate the circuit depending on which way you press it. Or maybe using a standard switch instead of a momentary one might be an answer. It is possible to wire two standard switches to independently control a circuit (like household lights that have a switch at each end of a hall).
It would be helpful if you could give some more details about what you're trying to connect. For example, it might be possible to wire a two-way momentary switch (like a factory convertible top switch) to both activate and deactivate the circuit depending on which way you press it. Or maybe using a standard switch instead of a momentary one might be an answer. It is possible to wire two standard switches to independently control a circuit (like household lights that have a switch at each end of a hall).
whoa, i was just thinkin about the same thing... and it sounds kinda like the same scenario, so lets see if we can combine thoughts to find an answer....
ok, i have my 12v pulse from my door locks that flash some neon lights i have on my car... i have it all set up through 2 relays so that if i switch on the lights manually, the pulse doesnt affect anything, and also when i have the car on the pusle doesnt do anything... so now, instead of them just flashing, i want to be able to turn them on and off with my remote (12v pulse door locks) sooo... how would i go about doing that? I need to get some sort of electronically controlled switch that will turn on when a pulse is sent through it, then when another pulse is sent through i want it to switch off... any ideas??
ok, i have my 12v pulse from my door locks that flash some neon lights i have on my car... i have it all set up through 2 relays so that if i switch on the lights manually, the pulse doesnt affect anything, and also when i have the car on the pusle doesnt do anything... so now, instead of them just flashing, i want to be able to turn them on and off with my remote (12v pulse door locks) sooo... how would i go about doing that? I need to get some sort of electronically controlled switch that will turn on when a pulse is sent through it, then when another pulse is sent through i want it to switch off... any ideas??
eww i fried a wire... hmm, now i have to figure out the problem... i used that latching relay, im going to take everything apart and make sure i have that set up right... and then i have a regular relay on the ground which is supposed to break the ground when a pulse is sent through it... is there anything i should know otherwise? cuz i cant figure out what the problem is...
