It's important that you choose to insulate this wire with a rubber boot or fill the hole with silicon. This retains the wire from currently being destroyed by friction with the firewall and shorting out. Most alarms appear with optional pin switches that trigger the alarm when the doorway opens. https://chancererad.look4blog.com/54095888/new-step-by-step-map-for-tips-to-check-into-when-selecting-a-car-alarm-installation-firm