[Modified by JOMO, 7:06 PM 3/8/2003]

 

oh man, this is the second time this happened damn type went back into the title!
sorry!

anyway, is it as simple as cutting one of the fuel pump wires and putting a switch n it, im thinking of having it behind the back seat under the cover and i would wire it myself...

is it this easy?
am i missing something/

 

I think you might be able to get away with it, but I would recommend that you use a relay.

 

thinks, exactly where would i put the relay?
i can install the switch easily and a relay doesnt sound that hard, could you give instructions?
it seems we should have a private chat room or sum'n top shotta, you answer all my questions first!

 

Your relay will go somewhere along the power wire for the fuel pump, and your switch will operate the relay. It should be fairly simple. Good Luck

 

I am an eletronic newb. I thought u can just use a switch. What is the point of a "relay?"

 

a relay is an electromechanical device...that is used to switch larger voltages
Its basically a switch...its triggered by smaller voltages as little as 150 ma.
What all of "electronically challenged" fail to realize is that by imobilizing the
"whole" ignition circuit...the car will 'crank',but not start...basically mimicing
a breakdown situation. The circuit could be hidden anywhere and triggered
by almost any type of circuit...you are limited by your imagination and
skill.

Just the facts.

 

I know enough about electronics to work on stuff like this comfortably.
and I know enough about myself to predict that after one week of installing a killswitch I and just going to leave the switch on when I leave the car.

A goed use for a rely here could be to devise a small circuit with a button which you need to press before starting and after turning the key to ACC. (when you can hear the fuelpump whir for a bit.)
after you turn of ignition the circuit will reset itself and disconnect power to the fuelpump.

I'll raw a little schematic and post it in a little while.

 

the dots are the two ends of the wire which suplies a switch 12v to the fuelpump, once you cut it.

the numbers 30, 85-87 correspond to a standard relay available at any carpartshop.

S1 is a momentary switch. (a button) there is only continuity when its pressed.
S2 is the switch in the relay which is controlled by the coil with which the dotted line connects it.

when you have turned you ignitionkey they will be power at the left dot. but only after you press S1 there is power at the right dot.
once the power at the left is switched of the circuit disconnects itself.

also read this, they did about the same thing in the first schematic, but I didn't see the use of the second relay.
http://www.the12volt.com/relays/page2.asp#psk

offcourse I can't be held liable for any damages or whatever caused by someone trying to use this schematic.

 

good schem...I have an idea...
why not interupt the whole ignition system? I basically do
this on manual tranny vehicles so that they cant be push
started....car would basically crank but not start. This type
of immobilzer in addition to a great install of a security should
deter the car thiefs.

 

**** the relay, its not like your going to be turning the car on with the switch off, just make sure its on when you start it. This is to insure protection against thiefs. If I was you I would take a switch of the fuel pump, ignition, and battery. Place the switches in consealed spots around your dash, under the glove box, w/e. Lets see a ****** thief start your car now. Or if the repo man pays a visit, eh eh.

 

it's not forgetting to switch on before starting. it about forgetting to switch it off after stopping.

 

There is no need for a relay as long as the switch you choose is strong enough to handle the current draw by the fuel pump.

Personally, I'm switching both circuits; fuel pump and ingnition. (more leyers for security )

 

read my replies in this topic...
the relay does protect the button, yes. but that's not mainly what it's there for.

have you ever forgotten to put your switch(es) bakc in the off position?
probably yes, that's what it's for.

 

ive had it this way for 5 years never a problem.. i use a metal switch . and i agree a relay is needed, but buying anothe switch is cheaper. plus its a high amp switch..

 

ok im getting a little confuses.... when you turn your car on isnt the pump on the whole time to pump fuel to your engine? Not just when you have to start it. So are you saying you must turn off the switch when you leave so your pump does not stay on.

I am good with the wiring but what would be the harm of leaving it on? Would a switch rated for 12vDC and 25Amps be worthy?

 

I am so missing what you guys are saying here too.

The relay is to ensure that the switch point doesn't spark, and that the contact and current draw is solid to the fuel pump.

If you connect a relay in line with your fuel pump, and have it triggered by a switch that is placed anywhere in the car, you could leave the switch on all day long, simply because the fuel pump does not get power when the car is off.

I think some of you may be thinking the relay is connected to a constant 12v. This is incorrect.

In order to start your car then, power must goto the relay, the switch must be on to allow the relay to pass the power to your fuel pump, and voila.

-Shane

 

damn, Jomo your still on H-T!! , and again with 0 posts !! How many times have you been kicked off? Lol, you've always given me a good laugh - but you got some craaz ideas - keep it real and take care,

Shane.

 

what's wrong about a killswitch being in the on position without you in the car is that it makes the switch useless.

You turn it of, and you're supposed to turn it on before you start. but a thief doesn't know where it is...