Intricate kill switch.. help?

mirrorimg

Well-Known Member
Intricate kill switch

Hey everyone, im somewhat stumped on how to wire this up, and looking for advice. I do not have all the parts I need in at the moment. I am waiting on wire, shrinkwrap, and a dpdt relay in the mail. Im using a design I found here. http://autospeed.com/A_107975/cms/article.html. I get the basics, and I think I understand how the automotive relay hooks, up, but I do not know about the dpdt relay. Its most likely because it isnt sitting in front of me, and I cant look at it. Are the contacts numbered like the automotive relay? With the Auto relay, I believe the contacts are as follows: power=86, ground=85, fuel pump 87&30 (though I dont know which +/- or if it would even matter) Where the relay connects to the fuel pump, from my understanding, the pump will not be wired to anything else. The power running to the fuel pump will instead be hooked to the dpdt? I think Im confusing myself even more. Anyone care to assist?:???:
 
Last edited:

Ominous G2

┌∩┐(◣_◢)┌∩┐
I've put one of those in, and yes you will confuse yourself. It's a lot easier with it in front of you, we did a lot of testing before we installed it.
 

mirrorimg

Well-Known Member
Yea I plan on putting it together on a desk before pulling the interior out of my car. Im just impatient and want to have an idea of what to expect. Since youve done one of these, does the wiring to the fuel pump go directly to the dpdt?
 

Ominous G2

┌∩┐(◣_◢)┌∩┐
I'm pretty sure it does. We just spliced it, and extended both ends to the relay.
 


mirrorimg

Well-Known Member
Ok, I got my parts in. I have everything I need minus the magnetic (reed) switch. Having trouble finding that locally. I am working on putting together a working model prior to install, but I dont know what the contacts on the dpdt relay go to. From looking at it, I see where power needs to go (9 or 12). I do not know where anything else should connect. I dont want to randomly hook up wires until it works, risking damage to the relay form incorrect attempts.

Edit: I found a diagram on another website that will probably help!

Ignore the writing in the picture, it was for some one else planning on hooking it up to a monitor in their car or something.
]
 
Last edited:

mirrorimg

Well-Known Member
Alright, After reviewing the diagram, and looking at my dpdt relay, I noticed that the connections were moved around some. Like so:
NC NC
NO NO
Common Common

So.... I wired it up, not sure which is pos/ neg power lines, and I do not think I need to ground the dpdt relay, please correct me if im wrong.... but this is how I THINK I should have it wired.

Pictu|2e:
And to tell you all which wires go to what connections I have as follows:
Hell, Ill just make a Paint diagram, I really dont want to type this all out.



And this is how my model Looks!!



If you compared the diagram from what I have laid out, then you will see I am missing a critical peice of this puzzle. My magnetic reed switch:lame So if I dont magically cmoe up with one tonight, I will be hunting down one tomorrow.

I Lied. I remembered reading about home alarm systems, and how they use magnetic switches (reed switches) for windows and doors. Soooooo since our alarm is obsolete, I decided to remove one from a door. :D Here is what it looks like. And I HOPE, im NOT POSITIVE that it will work. It needs to be an n/o switch, as in normally open, so that when the magnet passes over it, it completes the circuit. NOTE: DO NOT REMOVE THE SWITCH FROM ITS CASING! I think I may have broken mine trying to take it out because I was curious. It is glued in, and encapsulated with glue. Cant even see what it really looks like, but I can hear a crinkling noise when I flex it slightly, which is probably the (broken glass) it is surrounded by.
 
Last edited:

mirrorimg

Well-Known Member
I plan on using the green 14awg wire you see connected to the automotive relay in the upper right of one of the pics. I went with the red solid (non stranded) copper wire for the model. I dont want to waste my 20 ft of green wire for the build :)
 

mirrorimg

Well-Known Member
Well I planned on doing this install the past weekend, and to my dismay when I hooked up my relay to test it out in the car, after grounding it, I realized it didnt work. I listened carefully to the dpdt relay, and could hear some action, but it wasnt being thrown to the other contact. I quickly realized the number on the coil definitely had something to to with it... it read 24V. I know the cars batt is a 12V, so I technically dont have enough power to throw the switch.:lame So I need to run to an electronics store and find a new one. I'll keep anyone interested how this turns out when I finish.
 

mirrorimg

Well-Known Member
I finished hooking everything up, and laying all my wires out and tucking them along the wiring looms the best I could. Had some trouble wiring it all together, but managed to get it all right. I am running the power through the cig lighter plug right now, which is probably how I'll run it when I finish everything tomorrow (hopefully the rain stops). I wont go into posting pictures for the obvious reason of this being a hidden kill switch, but if anyone has questions on the wiring, I'd be glad to answer them.

Another note, with the power feed going to the cig lighter, I think I can do away with the push button switch to kill the feed to the fuel pump. There is no power going through the system when the ignition is off, so the led does not blink. After I turn it on, power feeds to the led until I 'flip' the switch allowing power through to the fuel pump.It automatically goes back to the off position when I turn the key to the off position because of the cut in power. The only way I see there to be a need for the button interuptor, would be if I used an 'always on' power source, such as straight from my battery.

I plan on leaving the button in because its already installed in one of the sections on the center console. And it will add to the confusion of someone trying to steal my car! :D
 
Last edited:
You must log in or register to reply here.
Top