tryingstar,

Alarm units that are disabled are usually disabled out of a reason. It is very well possible that the alarm malfunctioned (since 75% of all alarm systems tend to malfunction, especially at night).
I don't know how standard alarm systems in the US were, but the ones in the Netherlands are all after market and are disasters!!! We remove more alarm systems than we build in.

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)