derringer2 alarm headaches

Hi guys, I am a newbie here and mostly to vehicle alarm systems. My 1991 Mustang has an old school Derringer 2 VS-8910 with all the bells and whistles. Over the years, I believe this alarm has been the culprit of my problems when it comes to keeping the battery alive when stored for more than a couple of weeks. I always keep the battery disconnected and rarely drive the car, so when it's time I simply reconnect the battery and disarm the unit with the transmitter, start it up - everything is ok. Well, recently this alarm has recently been giving me a lot of problems. After reconnecting the battery the car started up, but when I shut it down and immediately restarted it, the alarm was cutting in the will the starter kill feature and not allowing me to start it. I tried everything from disarming from the remote (I think it no longer sees the remote or maybe the batteries are just getting weak), pushing the valet mode switch, disconnecting the battery and reconnecting it. I started getting frustrated and began pulling fuses from under the hood and one I found under the steering column all without any luck from disarming or turning off this darn thing. Well, I need to approach this in an educated manner and start asking for advice and wiring schematics. How can I turn or disconnect this darn thing off? Were these units known for it's unreliability? Any help would be greatly appreciated. Thanks, Eric

Derringer huh, now that is a blast from the past. When I used to work in the industry we stopped carrying the Derringer products for a variety of reasons but one was from a reliability issue. It could have been just the shop I worked for but considering the Avital/Clifford products (PRIOR to DEI buying them) worked flawlessly our conclusion was that it was indeed a problem with the Derringer products. My suggestion is to have the unit swapped with a newer system, the newer systems are built better, cost significantly less, have better operating range, have a warranty, etc. If you are looking to just stop the alarm, pop down the dash panel under the steering column. Take a look at the ignition switch wiring harness, you should see some wires tapped in, trace them back to the brain and pull the inline fuse(s). If the relay was wired in a normally closed configuration(the 'norm' for starter kill relays) the car should start right up. If the system was wired in a normally open configuration, you could reconnect the starter wire that was cut, in your car it would be a RED / blue or WHITE/ pink wire that is coming from the ignition switch down to the firewall area. There will be either 2 wires running to the brain of the alarm with each end connected to the cut starter wire or an external relay with the wires running to it depending on the model of the system. If you reconnect the cut starter wire after removing the fuses the starter circuit should operate normally. Installer, IT support, and FFL. I need less hobbies.