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Join Date: Jan 2003
Location: San Francisco
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Fuel and ignition kill switch?
I asked in the past but, being such the electrical virgin I am, can someone tell me in detail how to rig a kill switch to the fuel and another to the ignition? Is it okay to put a switch on both? What kind of switch do I use? Where do I get them?
Any info, please.
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1984 Carrera Coupe |
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07-09-2003, 09:21 PM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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What do want to do, theft deterence?
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-10-2003, 03:52 AM
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Irrationally exuberant
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I think a kill switch is designed to hack up the factory wiring and cause a no start condition stranding you in the middle of nowhere. Or at least it seems that way.
 -Chris "I hate alarms" Bennet (someone's 911 with this problem is in my garage right now)
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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07-10-2003, 05:28 AM
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Slumlord
Join Date: May 2001
Location: Canada
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If you want a kill switch for both go to Radio Shack and buy a DPST switch. Wire one pole in series with the fuel pump power line, one pole into your coil power or points circuit. Then hide the switch.
Presumably when you can't hear the fuel pump you know you forgot to turn on the switch. Probably a waste of time, but it's your time...
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-10-2003, 05:33 AM
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A waste of time? So, it's a bad idea?
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1984 Carrera Coupe |
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07-15-2003, 07:25 PM
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Location: St Petersburg, FL
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The switch your key fits into already does a pretty good job.
Why add another? |
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07-15-2003, 07:32 PM
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Platinum Member
Join Date: Jul 2001
Location: Leave the gun. Take the cannoli.
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The correct answer depends on your intent. If you are looking to add a 'racing' type kill switch, then these mount under the front hood near the battery. When activated, it will remove the battery from the circuit, and disable the ignition circuit.
If you want theft deterence, some options include deactivating the DME relay (do a search, this has been discussed before) or hiding a switch to turn off the fuel pump, etc.
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The truth is that while those on the left - particularly the far left - claim to be tolerant and welcoming of diversity, in reality many are quite intolerant of anyone not embracing their radical views. - Charlie Kirk |
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07-15-2003, 08:15 PM
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Moderator
Join Date: Dec 2001
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IF you go the racing route let us know. There is a very specific way to mount a 6PST racing disconnect so you don't fry your alternator.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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07-16-2003, 02:43 PM
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Purely for theft deterent, but I'm thinking I should just forget about it
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1984 Carrera Coupe |
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07-16-2003, 07:37 PM
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Location: Peoples Republic of Long Beach, NY
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Quote:
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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07-16-2003, 07:41 PM
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So you need some kind of time delay mechanism that will recognise when your hidden switch has not been flipped, and that will allow the car to run in this state for a minute or so....
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07-16-2003, 10:35 PM
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Quote:
it should be a multi-layered system.. doesn't have to be expensive. let him get thru the routine car alarm shop install system.. and then as he's home free.. tilt. that and a $100us alarm pager is nice.. for shopping, etc.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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07-16-2003, 11:23 PM
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Slumlord
Join Date: May 2001
Location: Canada
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A one minute on-delay relay in the fuel pump circuit by-passed by the user installed switch, that would really piss someone off.
But he said he was an electrical virgin... time to go to the local alarm shop. 
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-17-2003, 05:25 AM
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Fogcity, if you find a good, simple, inexpensive solution for a time-delayed kill switch, please post it - I would be interested in adding it to my car too.
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1989 3.2 Carrera coupe; 1988 Westy Vanagon, Zetec; 1986 E28 M30; 1994 W124; 2004 S211 What? Uh . . . “he” and “him”? |
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07-17-2003, 06:45 AM
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Slumlord
Join Date: May 2001
Location: Canada
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Just buy a 12 VDC on-delay relay from Radio Shack. Wire the coil of the relay into the ignition switch. When the ignition is 'on' it should provide power to this relay.
Wire the time delayed contacts of the relay into your fuel pump power(or coil power). After one minute the the contacts will open and you will have no fuel (or spark). Wire your by-pass switch in parallel with the contacts. When your car is missing start walking in a spiral with a maximum radius of about one mile.
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07-17-2003, 06:54 AM
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That sounds simple - huh? what?
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1984 Carrera Coupe |
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07-17-2003, 09:18 PM
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Slumlord
Join Date: May 2001
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The wiring or the spiral?
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-18-2003, 04:12 AM
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I couldn't find time delay relays on www.radioshack.com, but Holley makes one (for NOS applications!) http://www.holley.com/HiOctn/ProdLine/Products/NOS/NOSCA/DSTDswtch.html Most of the other time delay relays I found using Google (there were pages and pages of them) were for 120-240VAC applications.
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1989 3.2 Carrera coupe; 1988 Westy Vanagon, Zetec; 1986 E28 M30; 1994 W124; 2004 S211 What? Uh . . . “he” and “him”? |
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07-18-2003, 05:17 AM
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Slumlord
Join Date: May 2001
Location: Canada
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http://relays.tycoelectronics.com/relays/agastatdatasheets.stm#dis (SSC series available 12 VDC)
or Omron (HC1 series I think).
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater Last edited by Porsche_monkey; 07-18-2003 at 05:36 AM.. |
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07-18-2003, 05:33 AM
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Slumlord
Join Date: May 2001
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Just one more devious thought: If you used a concealed 'proximity switch' you could make a totally hidden switch that would seal in a relay through its own contacts to enable the fuel and ignition, but be activated by any metal object held in front of it (a key or a ring) once the ignition was on.
No one would figure that out.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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07-21-2003, 02:06 PM
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The Blue Pheonix
1989 Porsche 911 Carrera 3.2
