Stupid ignition/fuel kill switch how to

[az_240]

I'm really really bad at electronics, my pager alarm crapped out on me and I live in a apt complex so I need to get some kill switches installed ASAP.

Are there any write-ups specifically for the s14 kouki including switches, gauge of wire and relays used. Tried searching and found some stuff to a miata and some other general info...nothing specific.

I see some people say to cut wire, install switch.... but then I see other people say thats not right.... a relay needs to be installed to keep fires from happening.

I dont even know what a relay is or how to make it work with a switch so if anybody can provide a link or some help I would appreciate it...

Right now I have 2 rocker switches from Radioshack. They each have 2 terminal things...... Rated at 10A at 125VAC or 6A at 250VAC.

Not sure what that means... just want to be sure it will work.

Thanks

[ThatGuy]

A lot of people are hesitant about posting this kind of writeup because it usually:

A. Show's johnny noob what wires to use to hotwire your S-Chassis :rl:

or

B. Gives away their secret security system :hide:


Good luck though. Perhaps someone can point you in the proper direction. I'm thinking grab an FSM, a Multi-meter, and go to town. :bow:

[az_240]

^yeah I kinda figured thats why there are no write-ups.

I wouldnt know how to use a multi-meter or read the FSM schematics.

I was hoping it was easy as finding a good location and installing the switch.... then I see people posting about relays and cars catching on fire and got scared

[LA_phantom_240]

I figured there's no writeups cause there are so many ways to go about this, like disabling the fuel pump, or disabling the starter, or disabling the coil, or whatever else floats your boat.

[projectRDM]

I'll tell you this to keep you on the right track, the ECU signal to the fuel pump relay is a low current feed. A simple SPST switch will work fine on it with no other relays or parts required. Nothing is going to catch on fire. In fact I don't see how anything would anyway but people like to type dumb shit on the internet to scare other people.

As far as what you choose to disable, the process is all the same if using a relay. All you're doing is opening a circuit.

You can also just take the relay out of the car and carry it with you.

[LA_phantom_240]

You can also just take the relay out of the car and carry it with you.

LOL. Never thought of that!:bigok:

[az_240]

I'll tell you this to keep you on the right track, the ECU signal to the fuel pump relay is a low current feed. A simple SPST switch will work fine on it with no other relays or parts required. Nothing is going to catch on fire. In fact I don't see how anything would anyway but people like to type dumb shit on the internet to scare other people.

As far as what you choose to disable, the process is all the same if using a relay. All you're doing is opening a circuit.

You can also just take the relay out of the car and carry it with you.

So your saying I will be fine with the standard rocker switches I have...

basically just cut the wire after the ecu and run some 16 gauge wire to the switch....and 16 gauge wire back to that ecu wire running to the relay?

Is the ignition switch the same way? Low current after the ECU?

Would rather not have to pull a fuse everytime.

Thanks for the help

[projectRDM]

So your saying I will be fine with the standard rocker switches I have...

basically just cut the wire after the ecu and run some 16 gauge wire to the switch....and 16 gauge wire back to that ecu wire running to the relay?

Is the ignition switch the same way? Low current after the ECU?

Would rather not have to pull a fuse everytime.

Thanks for the help

Only the fuel pump signal is low current. After the pump relay it's high current, just like the ignition switch or coil and would need a relay and fuse.

[krazycaron]

dude you want a quick easy way.....on the driver side in the wiring harness running to the back of the car....the fuel pump wire is i believe black with a white stripe, cut it,,,,,run your switch to somewhere where no one will ever see it, know about it and then run it back and continue it......hide the switch though. i would give my best friend the keys to my rhd with out any ? and even he doesnt know where it is. never trust anyone with ur secrets

[Om1kron]

Cause For Alarm ver6.DA - Honda / Acura Car Alarm Security - Civic, Del Sol, Integra, Prelude, CRX - version 6 (http://causeforalarm.thecarthing.com/version6/index.html)

nevermind the honda crap in the title. read up son...

here is a 240sx alarm idea thread but will help you with identifying eletrical stuff you may want to tap into.

http://causeforalarm.thecarthing.com/version6/stealth_alarm/nissan_240SX/index.html

The alarm in my car is a clifford 50.x

unless I disarm that shit the ecu, ignition, and fuel pump are dead. There is no jump starting the car or bypassing the alarm. No manual switches to override it. back up battery and interior sirens that will make ears bleed fuck all that outside noise stuff lol.

[projectRDM]

dude you want a quick easy way.....on the driver side in the wiring harness running to the back of the car....the fuel pump wire is i believe black with a white stripe, cut it,,,,,run your switch to somewhere where no one will ever see it, know about it and then run it back and continue it......hide the switch though. i would give my best friend the keys to my rhd with out any ? and even he doesnt know where it is. never trust anyone with ur secrets

Fail. Complete fail even.

That's a high current wire, running it through a regular SPST switch will put a load on both the circuit and the switch, resulting in it burning to the ground. There's no fuse protection on the output side of the relay.

Again, you can cut the input side of the fuel pump relay since it's low current from the ECU, but the above method is damn stupid unless it's fused and run through another relay.

[az_240]

So the fuel pump is really the only one you can do without getting too complicated?

What gauge wire is suggested if running 3ft or so?

Thanks

[98s14inaz]

240's love their grounds. Find a ground wire that controls something vital like fuel and put a switch on it. Done. I won't tell you where because my spots kick ass and I don't need you copying them. Just be creative.

[projectRDM]

So the fuel pump is really the only one you can do without getting too complicated?

What gauge wire is suggested if running 3ft or so?

Thanks

Yes. Fuel pump signal from the ECU to the relay. Low current. Cut it. Use whatever you want.

[krazycaron]

Fail. Complete fail even.

That's a high current wire, running it through a regular SPST switch will put a load on both the circuit and the switch, resulting in it burning to the ground. There's no fuse protection on the output side of the relay.

Again, you can cut the input side of the fuel pump relay since it's low current from the ECU, but the above method is damn stupid unless it's fused and run through another relay.
__________________
FORMERLY R240NA



not to be a dick.......it works just fine......i run mine that way and have never had a problem...... the thing you have to look at is how high of output is it really? that wire is like a 16 gauge........there is no way that the wire is pushing enough amps to burn up a regular switch and not burn that wire to the ground just by being on........sorry bro^^^^^^^i am a mechanic on BMWs......I do this shit for a living. dont tell me that its fail or gonna burn up unless your 100% positive....and even then....come talk to me ill show you my setup and its been that way for about a year and a half no......NO PROBLEMS YET!:2f2f:

[awesomenick]

A shit switch that a lot of cheap asses would buy still may not be able to handle the higher current after the relay. The fuse on the fuel pump in my car is a 15A iirc. So if you used a switch that was rated for higher than that it would be alright. But still, why wouldn't you just do it before the relay?

[krazycaron]

we are dealing with a guy that admits that he really doesnt know much about wiring......make things simple as possible for him.....lift the carpet next to the driver door(in the foot box area) find the wire, cut it, add the running wire with the switch, tie into the fuel pump wire and its done....no have to deal with all the bullshit about the relay or anything its right there and it takes 10 min the longest part of the whole job is figuring out where your gonna mount the switch.......

[projectRDM]

we are dealing with a guy that admits that he really doesnt know much about wiring......make things simple as possible for him.....lift the carpet next to the driver door(in the foot box area) find the wire, cut it, add the running wire with the switch, tie into the fuel pump wire and its done....no have to deal with all the bullshit about the relay or anything its right there and it takes 10 min the longest part of the whole job is figuring out where your gonna mount the switch.......

Making things simple would be to cut the signal wire, not the output wire. Your car may be fine, what working on BMWs has anything to do with I don't know, but you may also have a heavy duty switch too. You need to realize several things before posting on here:

1) You're 20yrs old. Your experience is Worlds away from others, no matter how skilled you think you are.

2) 90% of the members now active on here have way less experience than you do, and have less knowledge of automotive systems.

3) Current 240SX owners are commonly cheap and take shortcuts. Suggesting an easy way out of anything is what they want to hear, so if your method has pitfalls (it does if using a low current switch, if the wiring isn't crimped/soldered properly, etc.) those pitfalls will reveal themselves.

4) Anything you suggest on here will come back to bite you if the remote possibility exists for a problem to occur. The last thing needed here is a bickering match because someone followed your advice but used a switch rated at 1A, melted a harness, and is now paying a repair bill because you were wrong.

That's why I always post the safest method of doing anything, period. Whether it's easier, quicker, or even better is not the issue, when you're dealing with people who don't have the same level of experience as you you can't expect them to follow you. A brain surgeon doesn't hand a first year nurse a scalpel and tell them to begin cutting.
If you're going to insist on someone cutting the fuel pump output wire you have to insure they use a heavy duty switch rated at 30A, they fuse the lead to 15A (or whatever the OE circuit is rated) after the switch, and that the connections are tight, sealed, and permanent. Otherwise wire damage and fire are possibilities. On the signal wire if anything was to go wrong the car would just cut out from lack of fuel, that's it. There's no other risk involved.

[UNISA JECS]

making things simple would be to cut the signal wire, not the output wire. Your car may be fine, what working on bmws has anything to do with i don't know, but you may also have a heavy duty switch too. You need to realize several things before posting on here:

1) you're 20yrs old. Your experience is worlds away from others, no matter how skilled you think you are.

2) 90% of the members now active on here have way less experience than you do, and have less knowledge of automotive systems.

3) current 240sx owners are commonly cheap and take shortcuts. Suggesting an easy way out of anything is what they want to hear, so if your method has pitfalls (it does if using a low current switch, if the wiring isn't crimped/soldered properly, etc.) those pitfalls will reveal themselves.

4) anything you suggest on here will come back to bite you if the remote possibility exists for a problem to occur. The last thing needed here is a bickering match because someone followed your advice but used a switch rated at 1a, melted a harness, and is now paying a repair bill because you were wrong.

That's why i always post the safest method of doing anything, period. Whether it's easier, quicker, or even better is not the issue, when you're dealing with people who don't have the same level of experience as you you can't expect them to follow you. A brain surgeon doesn't hand a first year nurse a scalpel and tell them to begin cutting.
If you're going to insist on someone cutting the fuel pump output wire you have to insure they use a heavy duty switch rated at 30a, they fuse the lead to 15a (or whatever the oe circuit is rated) after the switch, and that the connections are tight, sealed, and permanent. Otherwise wire damage and fire are possibilities. On the signal wire if anything was to go wrong the car would just cut out from lack of fuel, that's it. There's no other risk involved.

werd 2 ur mutha

[kuruptR]

For someone else looking to install kill switches besides the OP. You can use switches you already have on the dash ie. rear wiper switch, cruisecontroll or what ever switches are no longer using in your car. Iv seen some cool ones similar to these :D

[awesomenick]

Making things simple would be to cut the signal wire, not the output wire. Your car may be fine, what working on BMWs has anything to do with I don't know, but you may also have a heavy duty switch too. You need to realize several things before posting on here:

1) You're 20yrs old. Your experience is Worlds away from others, no matter how skilled you think you are.

2) 90% of the members now active on here have way less experience than you do, and have less knowledge of automotive systems.

3) Current 240SX owners are commonly cheap and take shortcuts. Suggesting an easy way out of anything is what they want to hear, so if your method has pitfalls (it does if using a low current switch, if the wiring isn't crimped/soldered properly, etc.) those pitfalls will reveal themselves.

4) Anything you suggest on here will come back to bite you if the remote possibility exists for a problem to occur. The last thing needed here is a bickering match because someone followed your advice but used a switch rated at 1A, melted a harness, and is now paying a repair bill because you were wrong.

That's why I always post the safest method of doing anything, period. Whether it's easier, quicker, or even better is not the issue, when you're dealing with people who don't have the same level of experience as you you can't expect them to follow you. A brain surgeon doesn't hand a first year nurse a scalpel and tell them to begin cutting.
If you're going to insist on someone cutting the fuel pump output wire you have to insure they use a heavy duty switch rated at 30A, they fuse the lead to 15A (or whatever the OE circuit is rated) after the switch, and that the connections are tight, sealed, and permanent. Otherwise wire damage and fire are possibilities. On the signal wire if anything was to go wrong the car would just cut out from lack of fuel, that's it. There's no other risk involved.

projectRDM left out #5.

5) projectRDM knows more than you, so stop arguing and admit that you are wrong.