Did these cars ever come with a factory alarm? Sounds like a wire or 2 came loose somewhere... I've had it happen on my alarm install, need to go back in and solder them up, just haven't felt like doing it.. (and I never truely finished installing it either, bunch of the aux outputs aren't connected..)

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Ich liebe meine Autos!

1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete
1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday...
1981 Mercedes-Benz 300SD | Rear ended, retired in garage.
2009 Yamaha AR230HO | Das Boot

Excessive speeding? It ain't excessive till I redline!