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Old 08-06-2013, 08:36 AM
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Aftermarket Alarm Removal

After two years of procrastination, I decided it was time to replace the leaky heater core in my '93 Mustang LX, 5.0. With everything associated with the dash torn all to ____, I figured it would also be a good time to remove my aftermarket anti-theft alarm. I bought the car in January, 1994, and the alarm (an Avistar MkII by Automobile Security Technologies, Inc.) had already been installed by the original owner.

The car was stolen in April of that year, and the alarm was apparently bypassed by the thieves with no trouble at all; consequently, I have little or no faith in the alarm. The only thing that saved the car was a hidden fuel pump cutoff switch that I'd installed soon after I bought the car. The effing thieves couldn't start the car and left it in the middle of the street.

Anyway, I consider the alarm to be useless, and the wiring is a mess (see photos). I've searched on the internet and have not found anything specific on the procedures for removing an aftermarket alarm. I searched the forums on this site and have not been able to find anything.

Any advice?
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Old 08-06-2013, 09:26 AM
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Old 08-07-2013, 08:08 PM
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another hack job

Trace each wire, one at a time, of the anti-theft alarm system to the connection point to the main car harness.
Each wire that taps into a wire of the main harness needs to be removed and the main harness wire tapped.
Continue with all of the wires of the anti-theft system until the remaining (2) wires are seen.
If the remaining wires of the car harness that are connected to the anti-theft system are the same color, splice them together. This should do it.

vicrod
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Old 08-08-2013, 08:32 AM
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Vicrod,

Thanks for your response. I wound up doing exactly what you said, but it's good to have someone verify that what I'd done was the right way to do it. My alarm had 10 or 12 "tap" connections and three "cuts". The "cuts" routed the vehicle circuits through the alarm computer, and just as you said, were easily repaired by splicing the pair of same-colored wires together. The last "cut" that I spliced was for the clutch pedal position sensor, and once that was done all that was left was to plug the two sets of wires back into the female plug on the clutch pedal position sensor. Well, one plug snapped in just like it's supposed to, but I spent almost an hour trying different ways to get the second one snapped in. Of course, before that happened, I wrenched my back and haven't been back at it since Monday afternoon. The back's better, and I hope to finish this mess this coming week end.

To make a long story short, I haven't tried to fire the Mustang up because of the incomplete connection on the clutch pedal position sensor.

I've attached a pic of that *&^%)#$@ alarm system as it's laying on the floor of my garage. I haven't yet decided on how to wreak my revenge ... big hammer or fire! Maybe both.

Cheers,
Grog
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Old 08-08-2013, 09:04 AM
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A BFH just makes a BF mess when the parts scatter. Toasting it in a fire always works.

Whoever installed that mess - created a disaster. It always amazes me that cars even run afterwards
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Old 08-08-2013, 10:08 AM
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that sucks that it was by-passed. but locks and alarms are to keep honest people honest! hit it a few time with a 44 mag, then lite it up. also after looking at that spaghetti pile you might have a six pack in scrap copper. haha.
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Old 08-08-2013, 04:43 PM
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Irelands Child,

Yeah, the alarm was a mess as installed and I'm also surprised that the "thing" worked. I won't call my removal of the "thing" a success until I can get the Mustang cranked and running with all of the other stuff that the alarm tapped into also working. I hope to finish the job this weekend after my back has recovered from Monday's screw driver throwing session. I'll post here just to let everybody know whether or not the method I used (and recommended by vicrod) works.

Kitteratrod,

Thanks for the idea. I hadn't thought of the use of firearms to give the alarm "thing" a fitting sendoff, but now that you mention it, I'm thinkin' 12 gauge ... 00 Buck or #4 shot.

Cheers,
Grog
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