Printer Friendly Forum Posts - crimestopper ms 1 alarm trigger, engine kill

I hope someone can help me, I just finished installing the following in my 2007 chevy express 3500 box van:

icbm-7071 alarm, PLJX bypass, 520T back-up battery system, 530T window automation system, after market power windows and power door locks along with a crimestopper ms-1 GPS modem.

All connections are soldered, all the components are grounded to the same factory ground point at the drivers kick panel.

Along with all of this I have various pin switches controlling relays which in turn control cameras in the box and on the dash.

I also have two groups of relays; one group is controlling an air compressor via two independent ignition switches (combined relay combinations from the schematics posted here) The other group controls emergency lighting.

There is one relay that I wired up using a transistor/capacitor/diode/resistor to allow a relay to be turned on for 7 minutes if the siren goes off, this relay controls three other relays, one turns on all the cameras for the 7 minutes, another turns on the inner box lights for 7 minutes, the other relay simply gives me a switched ground (pin 30 ground, pin 87 connected to the MS-1 GPS modem that is supposed to trigger a text message to my phone)

I'd like to add that all triggers are diode isolated where appropriate, every aspect of all the other components work perfectly...I made the effort to use every feature the (cheap) alarm had as a fun project for me, so everything is connected.

The problem:

Grounding trigger (I/O #1) on the ms-1 does absolutely nothing.

I have to also add that every other feature on the GPS modem works; (-) Door unlock output works as it should, GPS tracking works as it should.

I also tried I/O#2 which is a generic input, via the website I programmed it as an alarm trigger and grounding it also does nothing.

By accident I figured out that the triggers will only work when connected to the negative end of a relay, and by doing a little testing I figured out that they only work if the trigger rests at ground and is quickly switched to positive (which is what it sees when connected to the negative leg of a relay coil)

So my question is this: does this make sense? The wiring instructions clearly state that it's a (-) alarm trigger input, during my testing I found the second programmable input (I/O#2) works exactly the same way.

Question#2

The GPS modem has a starter kill feature; the alarm already has such a feature. I'd like to use it as a remote kill engine feature where I can send the signal remotely and possibly fry a fuse or group of fuses safely without starting a fire so that it's harder to bypass while I retrieve the vehicle in the event it does get stolen. Anyone have any suggestions as to what I can short out and where? This feature i'd like to wire up is something that would ever be used unless forced to, the equipment on in the van is worth many times more than the van, so i'm not concerned with destroying a few components to disable it.

Sorry for such a long post, I hope I gave enough information, everything i've accomplished on this van I credit to this web site, I feel like a kid again learning something new that i've always had an interest in, but never actually tried.

thank you