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kill switches/relays.

Discussion in 'Car Audio / Security / Electronic Accessories' started by GSRCRXsi, Dec 12, 2004.

  1. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

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    ok since there was some talk of them in another thread i decided to make a thread soley about it. ive been thinking about it for a while and i wont put my crx back on the road til i have a nice kill switch. this is pretty much what i was thinking of doing.

    [​IMG]

    this way you will have to put the car in the ON position, hold the switch, then start the car. just wondering what everytone else thinks about this. and maybe if anyone else has any better ideas to go about this,

    note, i didnt completely make that pic, i altered it a little and i might not hook it to the starter signal, i might hook it to the fuel pump or somewhere else. also looking for ideas on this.
     
  2. hcivic.com

    hcivic.com Senior Member

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    rather than do all that work just hook up a on or off switch to the fuel pump
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Oh I think I got it now.... you want to connect #30 from the right side relay to the #85 on the left, and not connect #85 on the left to the ignition 12V line. With the ignition 12V hooked up to #85, your switch is useless.
     
  4. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

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    hcivic, the reason im using a relay instead of a switch is because theres potential problems using a switch. it could melt or break from too much current. a relay is much better.

    mike, the reason i have 87 and 85 connected is so that the relay will be self sustaining once the car is running. 30 and 87 will both be from the two ends of the same ign. wire. cut the ignition wire and put the relay in the middle. the idea is to have to direction of current flow to be from pin 30 to pin 87. that way nothing gets power until i turn the key to the ON position (letting power run to the pin 30 and the switch) then you press the switch on the relay (which will open the switch in the relay and provide power to the 2nd relay to allow power to the pump) then after you start the car you can let go of the switch and the first relay will stay open because the switched wire is a power wire to run the relay. make sense?
     
  5. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Not really. :shrug:

    I can't do circuits right now. :(
     
  6. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

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    ok ill modify the picture to hopefully help.
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  8. hcivic.com

    hcivic.com Senior Member

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    no it wont the starter is not drawing a current from the wire it just activates a soliinoid. i have had the crappy 1.25 switch in my truck for a long time now ( it been under water more times than i can remember. so has everybody i know whit out a single problem just buy a better switch the cheapos break and fall apart after a year or so
     
  9. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

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    umm i never said the starter draws a current. the starter wire is just going to be switched by the relay in the presence of a voltage. now that voltage will come from the first relay. and if the switch isnt held down, it wont get the voltage across its inductor to turn the switch on. you have to remember that the switch im gonna be using is a momentary switch. you dont flip it one way or the other. you press it down to complete the circuit but once you let off it opens again. so the first relay has to be self sustaining, or else once i let off the swich the car would shut off. that is the reason for the jumper from 87 to 85. since the switched wire is a power, you can split off of it to power the relay. but this requires an initial power to be added to start the system. thats where the momentary switch comes in.

    heres a pic to show the how everything will flow.

    [​IMG]
     
  10. YouKnowWhoIBee

    YouKnowWhoIBee my avatar is better.

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    Then you are starting your motor with no fuel for a second and i know i dont wanna do that. But you idea seems to work so far. When are you gonna attempt this? And if it works for you i will use it also. :D I have been meaning to do this for a while but there is alot of things that you shouldnt over look.
     
  11. hcivic.com

    hcivic.com Senior Member

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    i have dont it all my cars have a shut off at the pump
     
  12. 93Fury

    93Fury Member

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    I really dont see why it is nessicary to cut the starter wire off unless the ignition is applied. If they are to the point where the car should crank, then ignition will be present and the only obsticle will be finding, or knowing about, your hidden switch. Make it simple, the bottom pinouts should work great.

    87-- Motor side of starter wire
    86-- Normaly CLOSED switch, with other side to 12 volt connection.
    85-- Chassis Ground
    30-- Key side of starter wire
    87A-- No Use

    Guess thats just another way, but either look great. On your diagram it calls for the switch to be normaly open, which would render it useless. Also, on the right relay, it shows the switch connected to 12volt ignition along with the oposite (sp?) side of the switch. This would cause nonthing more than 12volts switched any time the key is turned. If that was the case, you would probally eliminate the top right 12volt ignition and simply allow the switch and relay to control the 87 activation.

    EDIT: 30-- Key side of starter wire
     
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