Need help deciphering a wiring diagram
 

I have decided to change the type of kill switch I have to one that is slightly more complicated. Anyway, I have the wiring diagram, but when I compare it to the connections on my DPDT relay, it doesn't make much sense. Check out this diagram:

http://a1.g.akamai.net/7/1/5509/9120.../0059_07hi.jpg

Here's the link to the whole thing:
http://www.autospeed.com/A_0059/page1.html

Any thoughts would be appreciated. :)

I agree that the schematic blows. That's why I couldn't figure it out. Granted, my knowledge of electronic components is mediocre at best.

The NC push button must complete the ground for the relay, so that when you push it, it breaks the circuit, thereby cutting power to the other relay and disabling the car. So I'm guessing that they jumpered the relay in some way since the reed switch only closes for a moment but the automotive relay must stay closed while the car is in operation. Okay, the more I type the more I'm confusing myself.

I may have to enlist the help of a friend who's an engineer.

BTW, the kill switch I have now is far more simple. I cut the starter wire and ran each end to a relay. Then, I hid the switch for the relay under my shift boot. The given effect, obviously, is that when the relay's not engaged then the current won't make it out to the starter wire from the ignition assembly. I guess it's effective enough, but I kinda liked the looks of the one shown in the diagram.

All right guys, I got it. I had to read the home page to understand how it works.

First you have to realize that the push button and the reed switch circuits both power the DPDT relay, but the push button cannot do so until you close the reed switch, because it goes through the relay. The push button is a normally closed momentary switch.

Okay, let me try a sequence description, its easier to understand than explain. When you pass the magnet over the reed switch, it closes that circuite which in turn activates the DPDT relay. That then makes the push button circuit hot, and the circuit powering the automotive relay. You can now start the car. As soon as you move the magnet away from the reed switch the car would die, so....the push button circuit has been routed through the same pole as the reed switch so it is now a closed circuit, so when the reed switch opens, the circuit continues to function until you press the normally closed momentary button which cuts the power to the DPDT relay, opens the automotive relay and turns on the LED.

Anybody follow, or should I reword it?

**Edit: as I am looking into this, I understand it, but I think the schematic is misleading, a DPDT relay shoudl have 8 pins, not six. Im on google now, be back shortly.**

Alright, I got it. I was right about the DPDT relay. There are 8 pins. 2 for power. Then each throw has a pin for position one, a pin for position 2 and a common pin. Look here for an example http://www.mpja.com/allpict.asp?dept=311

Anyway, I reworked the schematic a bit so that it made more sense, but I can't host it. If you want I'll email or someone could host it....Juts let me know.

orange, I'd be happy to host it. Please e-mail it to me at mcmullan@prodigy.net and I'll post it.

Thanks,
Eric

ohhh ,, you guys are giving me a hedache
Bruce

Yeah it is parallel, that's the way its supposed to be.

The one on their page is wrong....yeah yeah, I know "it can't be wrong, its their circuit"....its a poor representation. Look at the four pins on the relay, notice once doesn't even go anywhere?

I sent the schematic to hawkeye and he'll post it so you guys can see.

WTF i am a computer engineering technology graduate, we have drawn MANY MANY electrical diagrams and schematics but i have never seen this kinda shit before WTF!!!!!!!, WHO MADE THIS!!! this is rediculous! earth or ground connections are not represented by a friggin DOT, its a triangle, 12v+ (battery or cell) is represented by parralel unequal length lines, not ANOTHER DOT of the same size and color as ground!! who ever made this should jump off a cliff, as for understanding it.. i have no clue. a DPDT relay does not look like that in schematic form

this is a DPDT switch
http://users.actcom.co.il/~anthias/fig26.gif

this is a DPDT relay
http://library.thinkquest.org/10784/...relay_dpdt.gif

maybe the guy who made it should go here
http://library.thinkquest.org/10784/...=1&tqtime=0916

well, the regular relay would work like this:

pin 86 = from DPDT relay (of which i beleive is a 12v+)
pin 85 = ground
pin 87 = no connection
pin 87a = key side of starter wire
pin 30 = motor side of starter wire

here's the image that Orange Crush sent me to post:

http://www.betterhomeservice.com/images/wire.jpg

Hawkeye since you were the one with the original question, does the circuit make sense to you now?

well, no, not really. :(

Okay, the wire that is splice in with the reed switch, attaches to the common pin for the first throw...

Do you have a DPDT relay? I'll tell you the pin outs.

yep, it's a DPDT. Here's an image if the diagram for it.

http://www.betterhomeservice.com/images/dpdt.jpg

Okay. Pin 7 and pin 5 are both attached to the 12v power supply. Then Pin 8 goes to the reed switch. Splice into the wire with the reed switch and attach that to pin 6. Then the push button switch will go to pin 4. Pin 1 goes to the LED. Pin 3 goes to the automotive relay.

Keep in mind, if the directions didn't specify, the push button should be a normally closed momentary. That means that the only time the circuit is broken is when you are actually pushing the button.

Hope that helps.