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Remove/Disconnect old Cobra car alarm from wiring harness.


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#1 IanC

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Posted 18 January 2024 - 10:20 AM

Anyone had any experience with removing or disconnecting a Cobra car alarm from an LJ harness?
Any help or suggestions will be appreciated.

#2 hanra

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Posted 18 January 2024 - 11:45 AM

Couldnt imagine it would be too hard. Prob just an Ignition cut? 



#3 IanC

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Posted 19 January 2024 - 08:01 AM

Thanks Brad for the reply. It has this big thing on one end. Wasn't sure if I could just cut it off?https://photos.app.g...cSUSpQxfVgpDWWA

#4 RallyRed

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Posted 19 January 2024 - 08:25 AM

Never actually looked at one Ian, but always assumed they would have spliced it into some of the main supply circuits. i.e. so if you just cut it off, there will be a hole or two in some important circuits? ( start, ingnition etc) and car would be "immobilised".( assuming it's an immobiliser and not just a noise maker?).

 

I guess the people installing it in the day may have just made it sound the horn and flash the blinkers, but to be an "immobiliser" is should interupt the start and go circuits.

 

Reckon I'd be taking the time to untape the harness where it seems to go, and understand what goes where. 

Blinker & horn extra wiring may just be able to be chopped out, but start and ign. may need to restored to factory. 

 

As Brad said, not a lot of work, but may be best to understand it and do it once. Hope that helps.



#5 IanC

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Posted 19 January 2024 - 09:34 AM

Thanks Col. Yes I believe it has an ignition immobilizer in it. It had motion detection inside the car. I also have a pin like an earphone jack which also cuts the ignition. Maybe best to get a mobile auto electrician to do the job properly. Again thanks for the help guys :)

#6 Rockoz

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Posted 19 January 2024 - 10:37 AM

Disconnected a few old alarms over the years.

The people putting them in went for the easiest option they could find usually.

All I ever did was chase the alarm wiring back to where it connected into the original harness.

The connections were always either a splice join, or a cut and divert.

The alarm harnesses were rarely properly 'taped' into the original harness, but if they were they were easy enough to remove.

Just find a starting point and work methodically until you have removed it all.

Join any wires that were 'broken' for the alarm and insulate any that were just spliced.

 

Cheers

 

Rob



#7 IanC

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Posted 19 January 2024 - 01:52 PM

Thanks Rob. So if I cut all of the wires at that big round thing. I should be able to trace them to where ever they go, and remove them. If that's the case I might give it a go. My car also had an under dash air conditioner. As well as thermo fan. Hopefully I can find the aircon wires and remove them. I may need to run the thermo fan again though. Thanks everyone for the help and advice.

#8 Rockoz

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Posted 19 January 2024 - 06:15 PM

Yeah.

Just follow any wire that goes into the alarm back to the harness.

You should be able to tell the difference in the wires as you go.

Then its either rejoin or insulate and its done.

If you get stuck post a pic and will give you advice.

 

Cheers

 

Rob



#9 IanC

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Posted 20 January 2024 - 04:32 AM

Thanks Rob. I will have a go at it. And I probably will have to post some pics. Cheers for the help. :)

#10 IanC

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Posted 20 January 2024 - 01:00 PM

https://photos.app.g...Z6DdWgSAtLKvkYA Do these pic's make any sense?. Looks like the ones one the left are the alarm. There are two going to the boot. They may have been for the boot lid. I guess I have to keep peeling tape..

#11 Rockoz

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Posted 20 January 2024 - 02:51 PM

Looks like they have taped the alarm harness to the original wiring.

Get rid of the tape and then separate the original harness from the alarm harness.

That should make things simpler. 

Cant quite picture where the alarm box with the key is in the car.

 

But separation of the harnesses is the first step

 

Cheers

 

Rob



#12 IanC

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Posted 20 January 2024 - 03:00 PM

The alarm box goes in where the rear doors would be if it was a 4 door. If that makes sense

#13 Rockoz

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Posted 20 January 2024 - 03:06 PM

Yeah okay.

But just go through and separate the wiring.

It will make lots more sense once all the wires are apart and their terminations are located.

 

Cheers


Rob



#14 IanC

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Posted 15 February 2024 - 09:24 AM

Slowly getting there. I did as you said Rob and found the two wires leading to the boot were for an alarm switch in the boot. I also traced some wires that supplied power to the siren. The siren seemed to have an earth wire connected to the boby of the car. So I cut it. Hope I was supposed to. I also traced the main 6 or 7 wires, but they go up under the dash and I can't see where they go. I'm getting a camera of a plumber friend to try and see where they go. Again thanks everyone for the help.

#15 Rockoz

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Posted 15 February 2024 - 09:43 AM

Seems like you will be at the contortion/punishment stage soon.

You will likely find yourself bending in ways you never knew were physically possible.

 

Have fun.

 

Cheers

 

Rob



#16 IanC

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Posted 21 February 2024 - 11:19 AM

Wow, using those plumber camera's is like patting your head while rubbing your belly. I couldn't see bugger all. Just wondering if anyone can read electrical circuits. If you can tell by this if it's ok to just cut the wires somewhere?. Again thanks for the help. https://photos.app.g...7sq3fXZNDFzPiU7

#17 IanC

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Posted 21 February 2024 - 11:21 AM

Also this drawing was with it.https://photos.app.g...kJQzW8NaGxHpw16

#18 Rockoz

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Posted 21 February 2024 - 02:54 PM

On the first pic the only wire that needs attention is where the scissors are on the green wires.

Easy solution would be to find the green wires where you can access them, cut both of them then join the 2 ends that go back into the original harness.

 

The second pic is a bit of a challenge.

But it might be an attempt to get 12v to the coil on start.

I would chop all of it out.

Make sure the wire from the start switch goes to the starter solenoid.

Im assuming that it is still the standard ignition and start system otherwise?

I would just pull the micro switch out and see what happens with it gone.

Get rid of whatever doesnt look factory.

Then see if it works.

 

Hope you have a half decent multimeter if it wont work.

WIll help with finding where any issues are.

 

Cheers

 

Rob



#19 dron

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Posted 21 February 2024 - 04:44 PM

Looks like you will need to remove the dash cluster, Find the cut ignishion wire and starter wire and rejoin them.  I would solder and cover with dual wall heatshrink.  It has hot glue on the inside so it seals the jount and helps support it as well. 

 

Not that hard to get to but you will need to find where they cut the wires. If you are lucky you may find where the green wires on the 1st diagram is conected to the 2 halves of the ignishion wire by just following them back with the dash still in. May be cut at the bottom of the steering columb where the ignishion switch is.



#20 IanC

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Posted 21 February 2024 - 06:39 PM

Thanks for all the help guys. I really don't understand this stuff. But I'm hoping my mate does. Again thanks for the help. And I will be showing him what you have said. :)




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