Anti theft wiring help needed!

[sshec152]

I don't really live in a bad neighborhood but extra insurance is always good. I wanted to wire in a switch on the fuel pump circuit to kill it when needed, but first what wire/s would I be working with, where would these be located and what kind of switch would be sufficent? I wanted to also wire in a momentary push button into the start function kind of like a hidden push to start but you would still need the key in the ignition. Has this been done before? Could I wire it up to one of the horn buttons since there are 2?
Thank you, Steven

[prerunner1982]

I would use a relay when wiring up the kill switch to the fuel pump circuit, that way you don't have all the current going through the switch.

As far as a momentary switch, you could place one on the floor up to the left where the old bright light switches use to be. Could even use a bright light switch though not momentary for either the push button to start or the kill switch.

On my truck I have also spliced into the power wire for the ignition coil.

[sshec152]

I would use a relay when wiring up the kill switch to the fuel pump circuit, that way you don't have all the current going through the switch.

As far as a momentary switch, you could place one on the floor up to the left where the old bright light switches use to be. Could even use a bright light switch though not momentary for either the push button to start or the kill switch.

On my truck I have also spliced into the power wire for the ignition coil.
How would I wire up a relay? Those were always one of my big wonders with wiring other than that i'm pretty good with it. And does the Haynes manual have the wiring schematics in it or no, and for the coil, that would need to be a switch not a momentary one correct?

[NW99XJ]

WIRE________________________COLOR________________ LOCATION

12V CONSTANT________________RED_____________________Ig nition harness
STARTER WIRE________________YELLOW/GREEN_____________Ignition harness
12V IGNITION_________________BLUE_____________________ Ignition harness
12V ACCESSORY______________PURPLE_____________________ Ignition harness

Using a 30amp relay (SPDT - Single Pole Double Throw) or five post relay.

http://i1104.photobucket.com/albums/h328/jbchill1/SPDTrelay.jpg

http://i1104.photobucket.com/albums/h328/jbchill1/spdtpinshand.jpg

http://i1104.photobucket.com/albums/h328/jbchill1/httpi27tinypiccomoj3rsh.jpg

Get power from the ignition wire (blue) to feed 86,
ground 85
Cut the line to your starter wire (yellow w/ green stripe)
and place one end on 30
and the other end on 87

The relay is in a "normally open" state at rest....interrupting the signal to your starter
(or fuel pump if you decide to interrupt that, or which ever wire is cut in this case and hooked up as described.)

Once the key is placed in the ignition and turned, power is sent down the blue wire.
This will energize the coil and "close" the relay's contacts
....thus completing (reconnecting) the circuit (wire) that had been previously interrupted.

Once the key is shut off, the relay resorts back to its "normally open" state and interrupts the wire once again.

The same installation can be done but instead of using the ignition switch you would use a switch of your choice.
85 would still be grounded,
but a 12v fused power source (preferably pulled from fuse block or blue wire as described above) would be ran thru a switch and hooked to 86.

To do a push button start....refer to this diagram:
http://i1104.photobucket.com/albums/h328/jbchill1/pushbtnstrt.png

This pic was pulled from my response in this thread on the same subject (push button start)
http://www.xjtalk.com/showthread.php?t=12262

Hope this helps.

[sshec152]

Thank you for the very helpful information but 2 questions. What is the thing that says fastronix on it and would the push button just go between the battery and 86 or ignition wire(in this case blue) and 86?

[NW99XJ]

Oops, sorry, the thing with fastronics on it is just an example of a universal starter solenoid. Available at any auto parts store or pulled from an older vehicle at a JY. They're all set up pretty much the same way.

And yes, the push button in this case would go in between the ignition wire (preferably) and 86. All this is used for is energizing the coil of the relay to send power to the solenoid to then send power to the starter.
If you hooked it up to the battery and 86...the ignition would not energize the ignition wires, or the accessory wires, and you wouldn't be able to actually start the vehicle. The starter would just sit there and crank.

For clarification purposes I highly recommend you read the thread I linked to above.... it lists things a little more detailed, and puts it all into context.
(sorry not trying to tell you what to do here...lol)

[sshec152]

Oops, sorry, the thing with fastronics on it is just an example of a universal starter solenoid. Available at any auto parts store or pulled from an older vehicle at a JY. They're all set up pretty much the same way.

And yes, the push button in this case would go in between the ignition wire (preferably) and 86. All this is used for is energizing the coil of the relay to send power to the solenoid to then send power to the starter.
If you hooked it up to the battery and 86...the ignition would not energize the ignition wires, or the accessory wires, and you wouldn't be able to actually start the vehicle. The starter would just sit there and crank.

For clarification purposes I highly recommend you read the thread I linked to above.... it lists things a little more detailed, and puts it all into context.
(sorry not trying to tell you what to do here...lol)

Would I need another starter solenoid or would I use my factory one? And the keys still have to be in the ignition on the on position correct?

[4.3LXJ]

One thing I would add is that I would take the power for the push button off the ignition circuit. That way, no one can run your battery down trying to start it if they do find the button.

[sshec152]

One thing I would add is that I would take the power for the push button off the ignition circuit. That way, no one can run your battery down trying to start it if they do find the button.

Would it be possible to use one of the horn buttons for the starter.........not like I would actually use that or anything.....

[4.3LXJ]

You can use any kind of momentary switch you want, but you still will need to follow the above example. Bear in mind that the solenoid on the XJ is on the starter and the small relay is the starter relay on the fender, unless you want to bypass that and then you would still use the small relay.

[sshec152]

Wait so is the fastronix thing the same as the silver cylindrical thing on the starter?

[4.3LXJ]

yes

[sshec152]

yes

OK thank you, clears a lot of things up, and i can use that as the solenoid in the picture right?

[4.3LXJ]

yes. That is what it is

[sshec152]

OK thank you both very much!

[4.3LXJ]

Your welcome

[sshec152]

Wait so is everything in the blue already there and i would just need to add the switch into the blue(12v ignition wire)?http://i1244.photobucket.com/albums/gg566/sshec152/start.png

[4.3LXJ]

Sorry we were so confusing. All you need to do is go from a power source to the push button and from there to the ignition terminal on the starter relay. Everything is already there.

http://i649.photobucket.com/albums/uu215/warriorsuspension/starter_motor_relay1_199c-1.gif

[NW99XJ]

Sorry we were so confusing. All you need to do is go from a power source to the push button and from there to the ignition terminal on the starter relay. Everything is already there.

http://i649.photobucket.com/albums/uu215/warriorsuspension/starter_motor_relay1_199c-1.gif

OH SURE TAKE THE EASY WAY OUT!!!!
:)
He's right that would be the easiest and most cost effective way of doing this... I have a hard time NOT thinking in universal terms, and in this case completely disregarded the factory relay.
You will still need to have the key on to start though.
Otherwise the fuel pump, coil, and accessories wont be powered up.

[Mudderoy]

Shameless plug, you might want to listen to the "Electrical & Audio Tips!" segment in this episode of the XJ TALK SHOW!

http://www.xjtalkshow.com/index.php/2012/10/episode-51-october-14th-2012-xj-talk-show/

:D

[sshec152]

Sorry we were so confusing. All you need to do is go from a power source to the push button and from there to the ignition terminal on the starter relay. Everything is already there.

http://i649.photobucket.com/albums/uu215/warriorsuspension/starter_motor_relay1_199c-1.gif

Ok thank you, this is exactly what i wanted to know!

[sshec152]

Are the 2 horn buttons on 2 seperate circuits or do they eventually come together? If so where at?

[4.3LXJ]

Two horn buttons? I have only one.

[sshec152]

Two horn buttons? I have only one.
These are the 2 I am speaking of.
http://i1244.photobucket.com/albums/gg566/sshec152/photo.jpg

[4.3LXJ]

Sorry, newer Jeep. They should both be wired together

[NW99XJ]

Horn trigger wire is smaller (solid black) wire in the harness that cones down the steering column.
It is a (-) negative trigger.
(meaning when you press the button the wire goes from neutral to ground)

[sshec152]

Sorry, newer Jeep. They should both be wired together

So I couldn't use one as the ignition momentary button and keep the other as the horn button?

[NW99XJ]

sorry, but no.

[sshec152]

ok thanks anyway.

[XJ Wheeler]

That wouldve been cool though. How about a dash switch that's momentary? I think the rear window washer is a momentary switch, you could get one and put it in the dash right?

[sshec152]

What amp rating would the momentary switch need to be if i spliced it in with the ignition wire(blue)?

[sshec152]

That wouldve been cool though. How about a dash switch that's momentary? I think the rear window washer is a momentary switch, you could get one and put it in the dash right?

If I can find a momentary switch like so, http://i1244.photobucket.com/albums/gg566/sshec152/momentary-action-push-button-switch-7208-2720757.jpg that would work I think I might have a really stealty place to put this.

[4.3LXJ]

Since this is a function you cannot be without, I would suggest you go with some good switches. That one looks like something from Radio Shack. This one might be better for you

http://www.carlingtech.com/pushbutton-switches-641-series

[sshec152]

Since this is a function you cannot be without, I would suggest you go with some good switches. That one looks like something from Radio Shack. This one might be better for you

http://www.carlingtech.com/pushbutton-switches-641-series

Yeah i just got a general pic from google, but does the switch need a certain amp rating or will the 5 amp Carling do fine?

[4.3LXJ]

Yes, since at 12V it will have even more amps it can handle.

[sshec152]

Yes, since at 12V it will have even more amps it can handle.

oh nice i just realized it was 5 amps at 125v, thanks a lot!

[sshec152]

Where do you get these switches from, I can't find them anywhere?

[4.3LXJ]

Check with a NAPA parts store. They will order you one

[cpttuna]

the ignition cutoff switch and the battery cutoff switch should also be considered. both can be very effective. I have had both on my 78 bronco. I have set the ignition cutoff switch( forgot that I had set it ) and drained the battery trying to start it forgetting to reset it first.

[prerunner1982]

What amp rating would the momentary switch need to be if i spliced it in with the ignition wire(blue)?

If you use a relay then you can use almost any little switch you would like to activate the relay.

[sshec152]

If you use a relay then you can use almost any little switch you would like to activate the relay.

How would i go about doing that?

[Mudderoy]

I don't know about you guys, but personally I'd want a bypass switch on the relay. It would be at the relay and if something failed, relay, wring etc... I could still get home.

Yeah I know it defeats the purpose of the kill switch, but that's why it's called a bypass. :D

[prerunner1982]

How would i go about doing that?

Take the battery and off road lights out of this picture, cut the power wire to the coil. Attach one end of the wire to tab 30 on the relay, attach the other end of the wire to tab 87.

http://www.titantalk.com/forums/attachments/titan-parts-accessories/56602d1203368466-how-wire-3-100w-off-road-lights-same-switch-foglite.jpg


I don't know about you guys, but personally I'd want a bypass switch on the relay. It would be at the relay and if something failed, relay, wring etc... I could still get home.

Yeah I know it defeats the purpose of the kill switch, but that's why it's called a bypass. :D

That or you can keep a piece of wire that had the right connecters to connect to the end of each ignition wire after they are removed from the relay.