Subject	Looking for ideas on ignition/kill switch
Posted by	spicyZ on April 21, 2008 at 8:31 AM
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Message	An acquaintance of mine has a pretty trick ignition kill switch system installed in their car, that I'd like to "copy". I've seen the simple fuel cutoff switch, which is fine and all, but I don't want to have to deal with digging around and flipping a toggle switch every time I leave the car someplace. I'm no electrical engineer, but I'm handy with a multimeter and soldering iron. I'll describe the system the way I envision it working, and I hope someone can help fill in the gaps. I have searched around Google and other car forums, but haven't quite found what I'm looking for. 1) I don't want the car to start until I activate a switch. I envision this as a contact/pressure plate switch (not an on/off switch). When pressed, it will send a signal to the ignition to allow starting of the car. 2) A secondary switch would be wired allowing me to bypass the system entirely - a valet switch, if you will. I'm fairly certain that the contact switch will simply signal a relay which will supply power to the ignition, but with a pressure/contact type switch, how will the power be maintained after the switch is released? Whoever installed this system in my friends car did a hell of a job, since it's deep inside the dash. I was hoping to inspect and reverse engineer it, but that didn't fare so well - and I wasn't about to rip his entire dash out ;-) When making contact on the switch, I could definitely hear a relay being triggered. After a couple of seconds (and not starting the car) I could here it "click" again, reverting to the "armed" state. Anyone have any ideas/suggestions/other write-ups that I could look up? Much appreciated. -jb -=-=-=-=-= your brillant (n/m) - Zski (Generation Z) 17:36:48 06/17/04 I finshed up the girl scouts last night...mmmm! - Spee 06:19 PM 07/02/04 I think we can all agree on the fact that i can never be 'cool' - genic 11:12 PM 12/13/04 THE RADIATOR DOES NOT USE AIR FLOW TO COOL TEMPS!! - THEDUCK 10:07:40 03/30/08
Follow Ups	Looking for ideas on ignition/kill switch - spicyZ 08:31:15 04/21/08 so you DID consider pulling my dash for a moment there! :) (n/m) - ZEngineer 08:54:38 04/21/08 Yes. - spicyZ 08:56:59 04/21/08 fuel pump relay (n/m) - The Devils Z 09:58:56 04/21/08 READ the post, then respond, thanks. (n/m) - spicyZ 10:35:22 04/21/08 Magnetic Switch... - nosduj 10:45:48 04/21/08 that works, but it doesn't answer the question. Allow me to - ZEngineer 10:55:04 04/21/08 How about a magnetic switch that toggles the starter relay - en5 11:17:20 04/21/08 Similar idea, but a PITA if I understand it correctly - spicyZ 11:42:37 04/21/08 I imagined that it was like a magnetic wand that when - en5 15:58:52 04/21/08 Actually, I think nosduj has the right idea - spicyZ 11:39:09 04/21/08 Re: Actually, I think nosduj has the right idea - nosduj 11:57:08 04/21/08 What reverts the switch back to the "open" state? (n/m) - spicyZ 12:10:24 04/21/08 As far as I know, it's held open by a small spring - en5 16:03:42 04/21/08 I did read your original post - The Devils Z 12:37:11 04/21/08 A contact/pressure switch is only on for as long... - spicyZ 13:04:52 04/21/08 I could be wrong --but you may be able to wire it in - The Devils Z 13:37:59 04/21/08 We have a large range of knowledge here - spicyZ 14:03:22 04/21/08 Perhaps a Timer Relay was used. - ked8923 14:38:31 04/21/08 I believe it would be the Off-Delay relay - ked8923 14:51:22 04/21/08 Hmmmm.. interesting... you could be right here. - spicyZ 14:59:25 04/21/08 np ;) (n/m) - ked8923 15:07:50 04/21/08 and... - ked8923 18:28:21 04/21/08 Try this place - not sure how expensive these are? - jzack 19:44:59 04/21/08 Since you've actually implemented something like this - spicyZ 20:12:22 04/21/08 Here is my solution, complete with part numbers - nosduj 22:49:28 04/21/08 WOW! This is exactly the type of info I'm looking for - spicyZ 07:45:35 04/22/08 good information !!!! nice use of radio shack p/n - The Devils Z 11:16:33 04/22/08 I see no reason why I can't substitute the magnetic - spicyZ 11:36:15 04/22/08 Yep or go really fancy and use some kind of biometric - jzack 18:13:25 04/22/08 bypass - nosduj 20:57:36 04/22/08 Nice write-up. (n/m) - TT XTZ 14:20:03 04/22/08 Well one I installed on an SUV used an aftermarket - jzack 23:00:13 04/21/08 This is also excellent information. - spicyZ 07:47:35 04/22/08 nice -- this system looks like it's a active 100% - The Devils Z 11:22:10 04/22/08 I always install a bypass switch across the contacts - jzack 11:56:57 04/22/08 I have a switch under my seat that kills starter - Mike87T 08:31:57 04/22/08 I want something more sophisticated than a toggle switch - spicyZ 08:48:57 04/22/08 so maybe just a simple push button switch? - Zluster 15:34:57 04/23/08
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