Jeep Wrangler Horn Alarm

By Jeep Experts


A daring particular person not too long ago selected to “break” into my Jeep and break open the locked middle console and glove field.  Luckily, I do know higher than to maintain something of worth in my automobile, and all of the thief took was my 15 12 months previous three D-cell Maglite.  I used to be most bothered by the truth that the Jeep was parked proper exterior my bed room window when the theft passed off, and I heard the console and glove field breaking open.  It was rubbish day, and I assumed the noise was one in every of my neighbors taking the rubbish cans out to the curb.  Needless to say I used to be fairly dissatisfied after I walked out to my Jeep the subsequent morning.  I instantly started pondering of the way to keep away from an analogous mistake sooner or later.

The apparent resolution to automotive theft worries is an alarm system, however I appear to have an aversion to paying for some elaborate noisemaker.  My lack of accessible funds is one justification, however basic “alarm apathy” is the principle issue for me.  What is the ratio of false alarms to actual emergencies?  When was the final time somebody heard a automotive alarm and did something?  I in all probability hear ten alarms beeping and honking at me on daily basis and I don’t even increase an eyebrow anymore.  Why spend the cash?

I’ve kicked myself again and again for not getting away from bed to analyze the noises exterior, however on the time I had no purpose to suspect it was not a rubbish can.  With this in thoughts I attempted to think about a option to cheaply rig the Jeep so I might hear an alarm if somebody opened the door whereas I used to be at dwelling.  I not too long ago Herculined the inside panels, and through that course of I pulled the fuse for the inside lights so I might depart the doorways open with out draining the battery.  The inside lights could also be activated by each the door switches and the headlight knob, so I believed the door switches might simply be liberated to be used in my “alarm.”  Since I used to be attempting to maintain issues low cost, I made a decision that the present horns can be my greatest wager for an alarm horn.

My unique, primary plan was to splice the horns onto the circuit with the inside lights, utilizing the present doorpost switches.  The apparent draw back to this plan is that the horn will honk each time a door is opened.  This is definitely prevented with a easy toggle change to open and shut the circuit to the horns.  I spotted that the change would should be mounted externally if I anticipated to show the alarm on from the skin, and this posed an issue.  While I might cleverly cover the change someplace, it could be inconvenient to dig round for a hidden change each time I park.  I’ve seen round locking switches mounted exterior automobiles, and on computer systems, and this appeared like an inexpensive resolution.

See also  Teraflex Control Arm Bushings By Mike Baney

I ended by a number of native electronics wholesale outfits, auto components shops and automotive stereo/alarm installers, however nobody appeared to have entry to a good locking change.  Radio Shack carried the lock in some unspecified time in the future for round $4.00, nevertheless it has since been discontinued.  JC Whitney additionally carries the identical lock for $9.99+ delivery.  Luckily one of many native Radio Shack staff was capable of observe down the half at a retailer about 15 miles away, so I made a decision to simply drive and choose it up.


Phillips screw driver, digital multi-meter, circuit tester, drill, dremel, wire stripper, aspect cutters, knife, soldering iron, 18ga wire, misc. wire connectors, heat-shrink tubing (and matches), electrical tape, zip-ties.

The change comes unwired, and I soldered wires on and shrink-wrapped them earlier than heading exterior.  In later footage you could observe that the black wire was changed with a second purple wire because the lock solely acts as a break in a constructive line.

With my lock prepared I headed exterior to begin tearing issues aside and searching for a passable option to wire the alarm.  The speaker cowl is held on by two screws, labeled 2 within the diagram, and it might be slid down and out after they’re eliminated.  I eliminated a foam insulator, and 4 screws holding the speaker within the sprint.  It was additionally useful to take away the sprint piece beneath the steering column which is held on by 4 screws, and the metal brace beneath it which is held on by 4 screws.  The decrease sprint piece slid over the headlight knob with none issue.

Once the speaker and decrease sprint items are eliminated, the door change, labeled 1 within the above diagram, was eliminated by pulling straight out of the opening.  The change portion slid off of the plug as pictured beneath.

The driver’s aspect door plug has three wires: strong yellow (inside lights constructive), yellow with black stripe (inside lights floor), black with inexperienced stripe (sizzling wire for beeper for keys left in ignition).  The passenger aspect door plug doesn’t have the black wire for the important thing warning beeper.  

See also  TeraFlex Swaybar Quick Disconnect Installation

Just behind the opening for the door change is an indentation within the two physique layers.  This offered a really perfect location for my locking change, so I drilled the opening and floor it to the suitable measurement.  I made a considerably feeble try and flatten one aspect of the opening to match the flat aspect on the locking change.  I extremely suggest putting a number of layers of tape over the drilling space.  I used to be lazy and you may see the large gouges I made to the left and proper of the opening (the ‘scratch’ on the backside edge is a slice of steel).  It is a good suggestion to place some primer on the within edges of the brand new gap, and I will likely be caring for the gouges with some touch-up paint.

Jeep Wrangler Horn Alarm

The locking change doesn’t include any sort of gasket for set up, so I needed to improvise.  I used two plastic rings from a spool of fifty clean CDRs.  With a little bit of Dremel work they match like a appeal.  (Before and after pictured beneath)

With the lock mounting out of the best way I acquired again to the precise wiring worries.  I seen that the horn relay below the hood runs to a 20A circuit, whereas the inside mild door switches run by way of a 10A fuse behind the glove field.  Originally I had deliberate to splice the horns into the inside mild circuit, however apparently that was not going to be a smart alternative.  I made a decision to tug the underside cowl off of the steering column to see if I might splice into the horn circuit nearer to the horn change.  After a little bit of investigation, I discovered the wire working from the horn to the relay.  It is a single purple wire with a yellow stripe, connected to a big plug simply behind the steering wheel.

At this level I spotted that the horn change simply grounds a sizzling wire to the horn relay below the hood, which really controls the horns.  This works out fairly effectively, because the relay circuit appears to run a reasonably small present (~.5A).  I made a decision I might remove the inside mild constructive (strong yellow) that runs to the door change plug, and run the horn to the plug as a substitute.

On each the motive force and the passenger aspect I minimize {the electrical} tape again about 3″ from the plug, then minimize the strong yellow wire.  I crimped a cap on the reside aspect of the wire, leaving 3″ of strong yellow wire on the plug aspect for me to splice within the horn jumper.  I made a decision to insert the locking change on the jumper between the horn relay and the door change plug.

See also  Power Steering Pump & Remote Reservoir

Since I needed each doorways wired into the horn, I needed to run a wire throughout from the passenger aspect to the motive force’s aspect.  I adopted the present wire loom throughout, zip-tying as I went.

The wire to the best aspect was spiced into the passenger aspect plug, then shrink wrapped and at last wrapped in electrical tape.  The crimped cap on the previous inside mild wire is seen in the best image beneath.

The wire from the passenger aspect was linked to the motive force’s aspect change, each of which had been linked to 1 aspect of the locking change.  The different aspect of the locking change was linked to the jumper from the horn relay on the steering column.  Connections had been crimped, shrink-wrapped and tapped up, and the whole lot was re-assembled.

This is a closing view of the lock from the skin.

I additionally bought a small purple 12v LED to connect to the sprint, however I’m holding off on putting in till I can discover an acceptable blinking LED.  The horn will likely be a pleasant wake-up name for me, and it’ll actually get the eye of a would-be thief, however in some circumstances a pleasant visible warning (apart from the lock) could make all of this pointless.

Final Note:

The total time I spent on this mission, as soon as I had secured the components, was about 5 hours.  Most of that point was spent following wires and checking circuits.  If I had to do that once more, it could in all probability take lower than an hour.  The whole value of this mission is lower than $10, particularly in case you have a pleasant choice of wires and connectors sitting round.  I don’t suppose the lock detracts from the looks of my Jeep, and I don’t really feel inconvenienced by the truth that my inside lights don’t come on after I open the door.  I can simply flip them on utilizing the headlight knob.  In my opinion it was a easy, clear, purposeful modification and I’m very pleased with it thus far.  I’ll undoubtedly be sleeping simpler, not feeling the necessity to soar up and look out the window at each sound.

If you have got any questions, you might be welcome to e-mail me.

Happy Wheeling,

Zach Matson

Leave a Comment